diff --git a/src/vec2.rs b/src/vec2.rs
index c94c4f0..5694d2d 100644
--- a/src/vec2.rs
+++ b/src/vec2.rs
@@ -269,7 +269,7 @@ impl<T:Copy + Real> Vec2<T> {
 
     #[inline]
     pub fn angle(&self, other: &Vec2<T>) -> T {
-        self.perp_dot(other).atan2(self.dot(other))
+        self.perp_dot(other).atan2(&self.dot(other))
     }
 
     #[inline]
diff --git a/src/vec3.rs b/src/vec3.rs
index 1ceff1f..bda3878 100644
--- a/src/vec3.rs
+++ b/src/vec3.rs
@@ -293,7 +293,7 @@ impl<T:Copy + Real> Vec3<T> {
 
     #[inline]
     pub fn angle(&self, other: &Vec3<T>) -> T {
-        self.cross(other).length().atan2(self.dot(other))
+        self.cross(other).length().atan2(&self.dot(other))
     }
 
     #[inline]