diff --git a/src/structs/mat.rs b/src/structs/mat.rs
index 5def5f5b..493250ff 100644
--- a/src/structs/mat.rs
+++ b/src/structs/mat.rs
@@ -21,6 +21,7 @@ use quickcheck::{Arbitrary, Gen};
 
 
 /// Special identity matrix. All its operation are no-ops.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcDecodable, Clone, Debug, Copy)]
 pub struct Identity;
 
@@ -33,6 +34,7 @@ impl Identity {
 }
 
 /// Square matrix of dimension 1.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat1<N> {
     pub m11: N
@@ -79,6 +81,7 @@ arbitrary_impl!(Mat1, m11);
 rand_impl!(Mat1, m11);
 
 /// Square matrix of dimension 2.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat2<N> {
     pub m11: N, pub m21: N,
@@ -129,6 +132,7 @@ arbitrary_impl!(Mat2, m11, m12, m21, m22);
 rand_impl!(Mat2, m11, m12, m21, m22);
 
 /// Square matrix of dimension 3.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat3<N> {
     pub m11: N, pub m21: N, pub m31: N,
@@ -221,6 +225,7 @@ rand_impl!(Mat3,
 );
 
 /// Square matrix of dimension 4.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat4<N> {
     pub m11: N, pub m21: N, pub m31: N, pub m41: N,
@@ -333,6 +338,7 @@ rand_impl!(Mat4,
 );
 
 /// Square matrix of dimension 5.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat5<N> {
     pub m11: N, pub m21: N, pub m31: N, pub m41: N, pub m51: N,
@@ -461,6 +467,7 @@ rand_impl!(Mat5,
 );
 
 /// Square matrix of dimension 6.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Mat6<N> {
     pub m11: N, pub m21: N, pub m31: N, pub m41: N, pub m51: N, pub m61: N,
diff --git a/src/structs/pnt.rs b/src/structs/pnt.rs
index 4dfde695..cca26e5d 100644
--- a/src/structs/pnt.rs
+++ b/src/structs/pnt.rs
@@ -19,6 +19,7 @@ use quickcheck::{Arbitrary, Gen};
 
 
 /// Point of dimension 0.
+#[repr(C)]
 #[derive(Eq, PartialEq, Clone, Debug, Copy)]
 pub struct Pnt0<N>(pub PhantomData<N>);
 
@@ -37,6 +38,7 @@ impl<N> Pnt0<N> {
 }
 
 /// Point of dimension 1.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt1<N> {
     /// First component of the point.
@@ -77,6 +79,7 @@ arbitrary_pnt_impl!(Pnt1, x);
 rand_impl!(Pnt1, x);
 
 /// Point of dimension 2.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt2<N> {
     /// First component of the point.
@@ -119,6 +122,7 @@ arbitrary_pnt_impl!(Pnt2, x, y);
 rand_impl!(Pnt2, x, y);
 
 /// Point of dimension 3.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt3<N> {
     /// First component of the point.
@@ -163,6 +167,7 @@ arbitrary_pnt_impl!(Pnt3, x, y, z);
 rand_impl!(Pnt3, x, y, z);
 
 /// Point of dimension 4.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt4<N> {
     /// First component of the point.
@@ -209,6 +214,7 @@ arbitrary_pnt_impl!(Pnt4, x, y, z, w);
 rand_impl!(Pnt4, x, y, z, w);
 
 /// Point of dimension 5.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt5<N> {
     /// First component of the point.
@@ -257,6 +263,7 @@ arbitrary_pnt_impl!(Pnt5, x, y, z, w, a);
 rand_impl!(Pnt5, x, y, z, w, a);
 
 /// Point of dimension 6.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Pnt6<N> {
     /// First component of the point.
diff --git a/src/structs/quat.rs b/src/structs/quat.rs
index 98afa714..509c42f1 100644
--- a/src/structs/quat.rs
+++ b/src/structs/quat.rs
@@ -20,6 +20,7 @@ use quickcheck::{Arbitrary, Gen};
 
 
 /// A quaternion.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Quat<N> {
     /// The scalar component of the quaternion.
@@ -158,6 +159,7 @@ impl<N: ApproxEq<N> + BaseFloat> Div<Quat<N>> for Quat<N> {
 
 
 /// A unit quaternion that can represent a 3D rotation.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct UnitQuat<N> {
     q: Quat<N>
diff --git a/src/structs/vec.rs b/src/structs/vec.rs
index f8a52c00..be3cf7f2 100644
--- a/src/structs/vec.rs
+++ b/src/structs/vec.rs
@@ -21,6 +21,7 @@ use quickcheck::{Arbitrary, Gen};
 
 
 /// Vector of dimension 0.
+#[repr(C)]
 #[derive(Eq, PartialEq, Clone, Debug, Copy)]
 pub struct Vec0<N>(pub PhantomData<N>);
 
@@ -39,6 +40,7 @@ impl<N> Vec0<N> {
 }
 
 /// Vector of dimension 1.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec1<N> {
     /// First component of the vector.
@@ -90,6 +92,7 @@ arbitrary_impl!(Vec1, x);
 rand_impl!(Vec1, x);
 
 /// Vector of dimension 2.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec2<N> {
     /// First component of the vector.
@@ -143,6 +146,7 @@ arbitrary_impl!(Vec2, x, y);
 rand_impl!(Vec2, x, y);
 
 /// Vector of dimension 3.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec3<N> {
     /// First component of the vector.
@@ -199,6 +203,7 @@ rand_impl!(Vec3, x, y, z);
 
 
 /// Vector of dimension 4.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec4<N> {
     /// First component of the vector.
@@ -256,6 +261,7 @@ arbitrary_impl!(Vec4, x, y, z, w);
 rand_impl!(Vec4, x, y, z, w);
 
 /// Vector of dimension 5.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec5<N> {
     /// First component of the vector.
@@ -315,6 +321,7 @@ arbitrary_impl!(Vec5, x, y, z, w, a);
 rand_impl!(Vec5, x, y, z, w, a);
 
 /// Vector of dimension 6.
+#[repr(C)]
 #[derive(Eq, PartialEq, RustcEncodable, RustcDecodable, Clone, Hash, Debug, Copy)]
 pub struct Vec6<N> {
     /// First component of the vector.