diff --git a/src/quaternion.rs b/src/quaternion.rs
index 45e7a96..b1ed288 100644
--- a/src/quaternion.rs
+++ b/src/quaternion.rs
@@ -417,7 +417,7 @@ impl<S: BaseFloat + 'static> Rotation<S, Vector3<S>, Point3<S>> for Quaternion<S
     fn invert_self(&mut self) { *self = self.invert() }
 }
 
-impl<S: BaseFloat> Rotation3<S> for Quaternion<S> {
+impl<S: BaseFloat> Rotation3<S> for Quaternion<S> where S: 'static {
     #[inline]
     fn from_axis_angle(axis: &Vector3<S>, angle: Rad<S>) -> Quaternion<S> {
         let (s, c) = sin_cos(angle.mul_s(cast(0.5f64).unwrap()));
diff --git a/src/transform.rs b/src/transform.rs
index f83397b..ea29f70 100644
--- a/src/transform.rs
+++ b/src/transform.rs
@@ -149,7 +149,7 @@ impl<S: BaseFloat + 'static, R: Rotation3<S>> ToMatrix4<S> for Decomposed<S, Vec
     }
 }
 
-impl<S: BaseFloat, R: Rotation3<S>> Transform3<S> for Decomposed<S,Vector3<S>,R> {}
+impl<S: BaseFloat, R: Rotation3<S>> Transform3<S> for Decomposed<S,Vector3<S>,R> where S: 'static {}
 
 impl<S: BaseFloat, R: fmt::Show + Rotation3<S>> fmt::Show for Decomposed<S,Vector3<S>,R> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -200,4 +200,4 @@ impl<S: BaseNum> ToMatrix4<S> for AffineMatrix3<S> {
     #[inline] fn to_matrix4(&self) -> Matrix4<S> { self.mat.clone() }
 }
 
-impl<S: BaseFloat> Transform3<S> for AffineMatrix3<S> {}
+impl<S: BaseFloat> Transform3<S> for AffineMatrix3<S> where S: 'static {}