diff --git a/src/lib.rs b/src/lib.rs
index 302791c..c2f65f5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -186,9 +186,9 @@ impl<B: StoreBackend> Store<B> {
 
     /// encode with `postcard`, write at `key`
     #[cfg(feature = "postcard-values")]
-    pub fn write_value<T: Serialize>(&mut self, key: &str, value: T) -> Result<(), Error<B::Error>> {
+    pub fn write_value<T: Serialize>(&mut self, key: &str, value: &T) -> Result<(), Error<B::Error>> {
         let mut buf = [0; 64];
-        let data = postcard::to_slice(&value, &mut buf)
+        let data = postcard::to_slice(value, &mut buf)
             .map_err(Error::Encode)?;
         self.write(key, data)
     }
diff --git a/src/test.rs b/src/test.rs
index 25b6eda..2dd8036 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -83,7 +83,7 @@ fn write_read_str_utf8() {
 #[cfg(feature = "postcard-values")]
 fn write_read_value_str() {
     let mut store = make_store();
-    store.write_value("foo", "bar").unwrap();
+    store.write_value("foo", &"bar").unwrap();
     assert_eq!(store.read_value("foo"), Ok(Some("bar")));
 }
 
@@ -91,7 +91,7 @@ fn write_read_value_str() {
 #[cfg(feature = "postcard-values")]
 fn write_read_value_u32() {
     let mut store = make_store();
-    store.write_value("foo", 42005u32).unwrap();
+    store.write_value("foo", &42005u32).unwrap();
     assert_eq!(store.read_value("foo"), Ok(Some(42005u32)));
 }
 
@@ -99,7 +99,7 @@ fn write_read_value_u32() {
 #[cfg(feature = "postcard-values")]
 fn write_read_value_i64() {
     let mut store = make_store();
-    store.write_value("foo", -99999999i64).unwrap();
+    store.write_value("foo", &-99999999i64).unwrap();
     assert_eq!(store.read_value("foo"), Ok(Some(-99999999i64)));
 }
 
@@ -107,7 +107,7 @@ fn write_read_value_i64() {
 #[cfg(feature = "postcard-values")]
 fn write_read_value_f32() {
     let mut store = make_store();
-    store.write_value("foo", 3.75e17f32).unwrap();
+    store.write_value("foo", &3.75e17f32).unwrap();
     assert_eq!(store.read_value("foo"), Ok(Some(3.75e17f32)));
 }
 
@@ -115,7 +115,7 @@ fn write_read_value_f32() {
 #[cfg(feature = "postcard-values")]
 fn write_read_value_f64() {
     let mut store = make_store();
-    store.write_value("foo", -1.999e-13f64).unwrap();
+    store.write_value("foo", &-1.999e-13f64).unwrap();
     assert_eq!(store.read_value("foo"), Ok(Some(-1.999e-13f64)));
 }
 
@@ -134,11 +134,11 @@ fn write_many() {
 #[cfg(feature = "postcard-values")]
 fn write_value_many() {
     let mut store = make_store();
-    store.write_value("quux", (false, 3u8, -42i16)).unwrap();
+    store.write_value("quux", &(false, 3u8, -42i16)).unwrap();
     for i in 0..1000u32 {
-        store.write_value("bar", i).unwrap();
+        store.write_value("bar", &i).unwrap();
         assert_eq!(store.read_value("bar"), Ok(Some(i)));
-        store.write_value("foo", i % 2 == 0).unwrap();
+        store.write_value("foo", &(i % 2 == 0)).unwrap();
         assert_eq!(store.read_value("foo"), Ok(Some(i % 2 == 0)));
     }
     assert_eq!(store.read_value("quux"), Ok(Some((false, 3u8, -42i16))));