diff --git a/src/mat.rs b/src/mat.rs
index 32942a0..3169534 100644
--- a/src/mat.rs
+++ b/src/mat.rs
@@ -182,7 +182,7 @@ pub impl Mat2: Matrix<float, Vec2> {
 
 pub impl Mat2: Index<uint, Vec2> {
     #[inline]
-    pure fn index(+i: uint) -> Vec2 {
+    pure fn index(i: uint) -> Vec2 {
         self.data[i]
     }
 }
@@ -431,7 +431,7 @@ pub impl Mat3: Matrix3<Vec3> {
 
 pub impl Mat3: Index<uint, Vec3> {
     #[inline]
-    pure fn index(+i: uint) -> Vec3 {
+    pure fn index(i: uint) -> Vec3 {
         self.data[i]
     }
 }
@@ -678,7 +678,7 @@ pub impl Mat4: Matrix4<Vec3, Vec4> {
 
 pub impl Mat4: Index<uint, Vec4> {
     #[inline]
-    pure fn index(+i: uint) -> Vec4 {
+    pure fn index(i: uint) -> Vec4 {
         self.data[i]
     }
 }
diff --git a/src/quat.rs b/src/quat.rs
index 9300cbb..b73831b 100644
--- a/src/quat.rs
+++ b/src/quat.rs
@@ -174,7 +174,7 @@ pub impl Quat: Quaternion<float> {
 
 pub impl Quat: Index<uint, float> {
     #[inline]
-    pure fn index(+i: uint) -> float {
+    pure fn index(i: uint) -> float {
         self.data[i]
     }
 }
diff --git a/src/vec.rs b/src/vec.rs
index 8e9ac56..c83f8ff 100644
--- a/src/vec.rs
+++ b/src/vec.rs
@@ -217,7 +217,7 @@ pub impl Vec2: Vector<float> {
 
 pub impl Vec2: Index<uint, float> {
     #[inline]
-    pure fn index(+i: uint) -> float {
+    pure fn index(i: uint) -> float {
         self.data[i]
     }
 }
@@ -411,7 +411,7 @@ pub impl Vec3: Vector<float> {
 
 pub impl Vec3: Index<uint, float> {
     #[inline]
-    pure fn index(+i: uint) -> float {
+    pure fn index(i: uint) -> float {
         self.data[i]
     }
 }
@@ -614,7 +614,7 @@ pub impl Vec4: Vector<float> {
 
 pub impl Vec4: Index<uint, float> {
     #[inline]
-    pure fn index(+i: uint) -> float {
+    pure fn index(i: uint) -> float {
         self.data[i]
     }
 }