diff --git a/src/structs/dvec.rs b/src/structs/dvec.rs
index 6936d185..0560caff 100644
--- a/src/structs/dvec.rs
+++ b/src/structs/dvec.rs
@@ -57,6 +57,11 @@ impl<N> DVec<N> {
     pub fn from_fn(dim: uint, f: |uint| -> N) -> DVec<N> {
         DVec { at: Vec::from_fn(dim, |i| f(i)) }
     }
+
+    #[inline]
+    pub fn len(&self) -> uint {
+        self.at.len()
+    }
 }
 
 impl<N> FromIterator<N> for DVec<N> {
@@ -73,13 +78,6 @@ impl<N> FromIterator<N> for DVec<N> {
 }
 
 
-impl<N> Collection for DVec<N> {
-    #[inline]
-    fn len(&self) -> uint {
-        self.at.len()
-    }
-}
-
 dvec_impl!(DVec, DVecMulRhs, DVecDivRhs, DVecAddRhs, DVecSubRhs)
 
 /// Stack-allocated, dynamically sized vector with a maximum size of 1.
diff --git a/src/structs/dvec_macros.rs b/src/structs/dvec_macros.rs
index c54c98e0..3f80c43d 100644
--- a/src/structs/dvec_macros.rs
+++ b/src/structs/dvec_macros.rs
@@ -377,9 +377,9 @@ macro_rules! dvec_scalar_sub_impl (
 
 macro_rules! small_dvec_impl (
     ($dvec: ident, $dim: expr, $mul: ident, $div: ident, $add: ident, $sub: ident $(,$idx: expr)*) => (
-        impl<N> Collection for $dvec<N> {
+        impl<N> $dvec<N> {
             #[inline]
-            fn len(&self) -> uint {
+            pub fn len(&self) -> uint {
                 self.dim
             }
         }
diff --git a/src/structs/vec_macros.rs b/src/structs/vec_macros.rs
index 9568a69c..863a2ef8 100644
--- a/src/structs/vec_macros.rs
+++ b/src/structs/vec_macros.rs
@@ -282,9 +282,9 @@ macro_rules! dim_impl(
 
 macro_rules! container_impl(
     ($t: ident) => (
-        impl<N> Collection for $t<N> {
+        impl<N> $t<N> {
             #[inline]
-            fn len(&self) -> uint {
+            pub fn len(&self) -> uint {
                 Dim::dim(None::<$t<N>>)
             }
         }