diff --git a/nalgebra-sparse/src/coo.rs b/nalgebra-sparse/src/coo.rs
index 3e3c7b4c..06788406 100644
--- a/nalgebra-sparse/src/coo.rs
+++ b/nalgebra-sparse/src/coo.rs
@@ -2,9 +2,6 @@
 
 use crate::SparseFormatError;
 
-#[cfg(feature = "serde-serialize")]
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
-
 /// A COO representation of a sparse matrix.
 ///
 /// A COO matrix stores entries in coordinate-form, that is triplets `(i, j, v)`, where `i` and `j`
@@ -278,52 +275,55 @@ impl<T> CooMatrix<T> {
 }
 
 #[cfg(feature = "serde-serialize")]
-#[derive(Serialize, Deserialize)]
-struct CooMatrixSerializationData<Indices, Values> {
-    nrows: usize,
-    ncols: usize,
-    row_indices: Indices,
-    col_indices: Indices,
-    values: Values,
-}
+mod serde_serialize {
+    use super::CooMatrix;
+    use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
-#[cfg(feature = "serde-serialize")]
-impl<T> Serialize for CooMatrix<T>
-where
-    T: Serialize + Clone,
-{
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    #[derive(Serialize, Deserialize)]
+    struct CooMatrixSerializationData<Indices, Values> {
+        nrows: usize,
+        ncols: usize,
+        row_indices: Indices,
+        col_indices: Indices,
+        values: Values,
+    }
+
+    impl<T> Serialize for CooMatrix<T>
     where
-        S: Serializer,
+        T: Serialize + Clone,
     {
-        CooMatrixSerializationData::<&[usize], &[T]> {
-            nrows: self.nrows(),
-            ncols: self.ncols(),
-            row_indices: self.row_indices(),
-            col_indices: self.col_indices(),
-            values: self.values(),
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            CooMatrixSerializationData::<&[usize], &[T]> {
+                nrows: self.nrows(),
+                ncols: self.ncols(),
+                row_indices: self.row_indices(),
+                col_indices: self.col_indices(),
+                values: self.values(),
+            }
+            .serialize(serializer)
         }
-        .serialize(serializer)
     }
-}
 
-#[cfg(feature = "serde-serialize")]
-impl<'de, T> Deserialize<'de> for CooMatrix<T>
-where
-    T: Deserialize<'de> + Clone,
-{
-    fn deserialize<D>(deserializer: D) -> Result<CooMatrix<T>, D::Error>
+    impl<'de, T> Deserialize<'de> for CooMatrix<T>
     where
-        D: Deserializer<'de>,
+        T: Deserialize<'de> + Clone,
     {
-        let de = CooMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
-        CooMatrix::try_from_triplets(
-            de.nrows,
-            de.ncols,
-            de.row_indices,
-            de.col_indices,
-            de.values,
-        )
-        .map_err(|e| de::Error::custom(e))
+        fn deserialize<D>(deserializer: D) -> Result<CooMatrix<T>, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            let de = CooMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
+            CooMatrix::try_from_triplets(
+                de.nrows,
+                de.ncols,
+                de.row_indices,
+                de.col_indices,
+                de.values,
+            )
+            .map_err(|e| de::Error::custom(e))
+        }
     }
 }
diff --git a/nalgebra-sparse/src/csc.rs b/nalgebra-sparse/src/csc.rs
index 7c7832b5..29861684 100644
--- a/nalgebra-sparse/src/csc.rs
+++ b/nalgebra-sparse/src/csc.rs
@@ -10,8 +10,6 @@ use crate::{SparseEntry, SparseEntryMut, SparseFormatError, SparseFormatErrorKin
 
 use nalgebra::Scalar;
 use num_traits::One;
-#[cfg(feature = "serde-serialize")]
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 use std::slice::{Iter, IterMut};
 
 /// A CSC representation of a sparse matrix.
@@ -523,53 +521,56 @@ impl<T> CscMatrix<T> {
 }
 
 #[cfg(feature = "serde-serialize")]
-#[derive(Serialize, Deserialize)]
-struct CscMatrixSerializationData<Indices, Values> {
-    nrows: usize,
-    ncols: usize,
-    col_offsets: Indices,
-    row_indices: Indices,
-    values: Values,
-}
+mod serde_serialize {
+    use super::CscMatrix;
+    use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
-#[cfg(feature = "serde-serialize")]
-impl<T> Serialize for CscMatrix<T>
-where
-    T: Serialize + Clone,
-{
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        CscMatrixSerializationData::<&[usize], &[T]> {
-            nrows: self.nrows(),
-            ncols: self.ncols(),
-            col_offsets: self.col_offsets(),
-            row_indices: self.row_indices(),
-            values: self.values(),
-        }
-        .serialize(serializer)
+    #[derive(Serialize, Deserialize)]
+    struct CscMatrixSerializationData<Indices, Values> {
+        nrows: usize,
+        ncols: usize,
+        col_offsets: Indices,
+        row_indices: Indices,
+        values: Values,
     }
-}
 
-#[cfg(feature = "serde-serialize")]
-impl<'de, T> Deserialize<'de> for CscMatrix<T>
-where
-    T: Deserialize<'de> + Clone,
-{
-    fn deserialize<D>(deserializer: D) -> Result<CscMatrix<T>, D::Error>
+    impl<T> Serialize for CscMatrix<T>
     where
-        D: Deserializer<'de>,
+        T: Serialize + Clone,
     {
-        let de = CscMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
-        CscMatrix::try_from_csc_data(
-            de.nrows,
-            de.ncols,
-            de.col_offsets,
-            de.row_indices,
-            de.values,
-        )
-        .map_err(|e| de::Error::custom(e))
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            CscMatrixSerializationData::<&[usize], &[T]> {
+                nrows: self.nrows(),
+                ncols: self.ncols(),
+                col_offsets: self.col_offsets(),
+                row_indices: self.row_indices(),
+                values: self.values(),
+            }
+            .serialize(serializer)
+        }
+    }
+
+    impl<'de, T> Deserialize<'de> for CscMatrix<T>
+    where
+        T: Deserialize<'de> + Clone,
+    {
+        fn deserialize<D>(deserializer: D) -> Result<CscMatrix<T>, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            let de = CscMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
+            CscMatrix::try_from_csc_data(
+                de.nrows,
+                de.ncols,
+                de.col_offsets,
+                de.row_indices,
+                de.values,
+            )
+            .map_err(|e| de::Error::custom(e))
+        }
     }
 }
 
diff --git a/nalgebra-sparse/src/csr.rs b/nalgebra-sparse/src/csr.rs
index 786736ff..6be91f94 100644
--- a/nalgebra-sparse/src/csr.rs
+++ b/nalgebra-sparse/src/csr.rs
@@ -9,8 +9,6 @@ use crate::{SparseEntry, SparseEntryMut, SparseFormatError, SparseFormatErrorKin
 
 use nalgebra::Scalar;
 use num_traits::One;
-#[cfg(feature = "serde-serialize")]
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 use std::iter::FromIterator;
 use std::slice::{Iter, IterMut};
 
@@ -594,53 +592,56 @@ impl<T> CsrMatrix<T> {
 }
 
 #[cfg(feature = "serde-serialize")]
-#[derive(Serialize, Deserialize)]
-struct CsrMatrixSerializationData<Indices, Values> {
-    nrows: usize,
-    ncols: usize,
-    row_offsets: Indices,
-    col_indices: Indices,
-    values: Values,
-}
+mod serde_serialize {
+    use super::CsrMatrix;
+    use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
-#[cfg(feature = "serde-serialize")]
-impl<T> Serialize for CsrMatrix<T>
-where
-    T: Serialize + Clone,
-{
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        CsrMatrixSerializationData::<&[usize], &[T]> {
-            nrows: self.nrows(),
-            ncols: self.ncols(),
-            row_offsets: self.row_offsets(),
-            col_indices: self.col_indices(),
-            values: self.values(),
-        }
-        .serialize(serializer)
+    #[derive(Serialize, Deserialize)]
+    struct CsrMatrixSerializationData<Indices, Values> {
+        nrows: usize,
+        ncols: usize,
+        row_offsets: Indices,
+        col_indices: Indices,
+        values: Values,
     }
-}
 
-#[cfg(feature = "serde-serialize")]
-impl<'de, T> Deserialize<'de> for CsrMatrix<T>
-where
-    T: Deserialize<'de> + Clone,
-{
-    fn deserialize<D>(deserializer: D) -> Result<CsrMatrix<T>, D::Error>
+    impl<T> Serialize for CsrMatrix<T>
     where
-        D: Deserializer<'de>,
+        T: Serialize + Clone,
     {
-        let de = CsrMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
-        CsrMatrix::try_from_csr_data(
-            de.nrows,
-            de.ncols,
-            de.row_offsets,
-            de.col_indices,
-            de.values,
-        )
-        .map_err(|e| de::Error::custom(e))
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            CsrMatrixSerializationData::<&[usize], &[T]> {
+                nrows: self.nrows(),
+                ncols: self.ncols(),
+                row_offsets: self.row_offsets(),
+                col_indices: self.col_indices(),
+                values: self.values(),
+            }
+            .serialize(serializer)
+        }
+    }
+
+    impl<'de, T> Deserialize<'de> for CsrMatrix<T>
+    where
+        T: Deserialize<'de> + Clone,
+    {
+        fn deserialize<D>(deserializer: D) -> Result<CsrMatrix<T>, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            let de = CsrMatrixSerializationData::<Vec<usize>, Vec<T>>::deserialize(deserializer)?;
+            CsrMatrix::try_from_csr_data(
+                de.nrows,
+                de.ncols,
+                de.row_offsets,
+                de.col_indices,
+                de.values,
+            )
+            .map_err(|e| de::Error::custom(e))
+        }
     }
 }
 
diff --git a/nalgebra-sparse/src/pattern.rs b/nalgebra-sparse/src/pattern.rs
index f7289438..1253982b 100644
--- a/nalgebra-sparse/src/pattern.rs
+++ b/nalgebra-sparse/src/pattern.rs
@@ -4,9 +4,6 @@ use crate::SparseFormatError;
 use std::error::Error;
 use std::fmt;
 
-#[cfg(feature = "serde-serialize")]
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
-
 /// A representation of the sparsity pattern of a CSR or CSC matrix.
 ///
 /// CSR and CSC matrices store matrices in a very similar fashion. In fact, in a certain sense,
@@ -293,44 +290,47 @@ pub enum SparsityPatternFormatError {
 }
 
 #[cfg(feature = "serde-serialize")]
-#[derive(Serialize, Deserialize)]
-struct SparsityPatternSerializationData<Indices> {
-    major_dim: usize,
-    minor_dim: usize,
-    major_offsets: Indices,
-    minor_indices: Indices,
-}
+mod serde_serialize {
+    use super::SparsityPattern;
+    use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
 
-#[cfg(feature = "serde-serialize")]
-impl Serialize for SparsityPattern {
-    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-    {
-        SparsityPatternSerializationData::<&[usize]> {
-            major_dim: self.major_dim(),
-            minor_dim: self.minor_dim(),
-            major_offsets: self.major_offsets(),
-            minor_indices: self.minor_indices(),
-        }
-        .serialize(serializer)
+    #[derive(Serialize, Deserialize)]
+    struct SparsityPatternSerializationData<Indices> {
+        major_dim: usize,
+        minor_dim: usize,
+        major_offsets: Indices,
+        minor_indices: Indices,
     }
-}
 
-#[cfg(feature = "serde-serialize")]
-impl<'de> Deserialize<'de> for SparsityPattern {
-    fn deserialize<D>(deserializer: D) -> Result<SparsityPattern, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        let de = SparsityPatternSerializationData::<Vec<usize>>::deserialize(deserializer)?;
-        SparsityPattern::try_from_offsets_and_indices(
-            de.major_dim,
-            de.minor_dim,
-            de.major_offsets,
-            de.minor_indices,
-        )
-        .map_err(|e| de::Error::custom(e))
+    impl Serialize for SparsityPattern {
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where
+            S: Serializer,
+        {
+            SparsityPatternSerializationData::<&[usize]> {
+                major_dim: self.major_dim(),
+                minor_dim: self.minor_dim(),
+                major_offsets: self.major_offsets(),
+                minor_indices: self.minor_indices(),
+            }
+            .serialize(serializer)
+        }
+    }
+
+    impl<'de> Deserialize<'de> for SparsityPattern {
+        fn deserialize<D>(deserializer: D) -> Result<SparsityPattern, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            let de = SparsityPatternSerializationData::<Vec<usize>>::deserialize(deserializer)?;
+            SparsityPattern::try_from_offsets_and_indices(
+                de.major_dim,
+                de.minor_dim,
+                de.major_offsets,
+                de.minor_indices,
+            )
+            .map_err(|e| de::Error::custom(e))
+        }
     }
 }