diff --git a/Source/OpenTK/Math/Vector2.cs b/Source/OpenTK/Math/Vector2.cs
index 9dad9391..5946fdd3 100644
--- a/Source/OpenTK/Math/Vector2.cs
+++ b/Source/OpenTK/Math/Vector2.cs
@@ -908,12 +908,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector2 vec, ref Quaternion quat, out Vector2 result)
         {
-            Quaternion v = new Quaternion(vec.X, vec.Y, 0, 0);
-            Quaternion i;
-            Quaternion t;
+            Quaternion v = new Quaternion(vec.X, vec.Y, 0, 0), i, t;
             Quaternion.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaternion.Multiply(ref quat, ref v, out t);
+            Quaternion.Multiply(ref t, ref i, out v);
 
             result = new Vector2(v.X, v.Y);
         }
diff --git a/Source/OpenTK/Math/Vector2d.cs b/Source/OpenTK/Math/Vector2d.cs
index 4c4c68f9..70bddeab 100644
--- a/Source/OpenTK/Math/Vector2d.cs
+++ b/Source/OpenTK/Math/Vector2d.cs
@@ -796,12 +796,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector2d vec, ref Quaterniond quat, out Vector2d result)
         {
-            Quaterniond v = new Quaterniond(vec.X, vec.Y, 0, 0);
-            Quaterniond i;
-            Quaterniond t;
+            Quaterniond v = new Quaterniond(vec.X, vec.Y, 0, 0), i, t;
             Quaterniond.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaterniond.Multiply(ref quat, ref v, out t);
+            Quaterniond.Multiply(ref t, ref i, out v);
 
             result = new Vector2d(v.X, v.Y);
         }
diff --git a/Source/OpenTK/Math/Vector3.cs b/Source/OpenTK/Math/Vector3.cs
index 35e52064..f297c110 100644
--- a/Source/OpenTK/Math/Vector3.cs
+++ b/Source/OpenTK/Math/Vector3.cs
@@ -1115,12 +1115,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector3 vec, ref Quaternion quat, out Vector3 result)
         {
-            Quaternion v = new Quaternion(vec.X, vec.Y, vec.Z,  0);
-            Quaternion i;
-            Quaternion t;
+            Quaternion v = new Quaternion(vec.X, vec.Y, vec.Z, 0), i, t;
             Quaternion.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaternion.Multiply(ref quat, ref v, out t);
+            Quaternion.Multiply(ref t, ref i, out v);
 
             result = new Vector3(v.X, v.Y, v.Z);
         }
diff --git a/Source/OpenTK/Math/Vector3d.cs b/Source/OpenTK/Math/Vector3d.cs
index 9ad39e2f..2c1fdc99 100644
--- a/Source/OpenTK/Math/Vector3d.cs
+++ b/Source/OpenTK/Math/Vector3d.cs
@@ -1111,12 +1111,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector3d vec, ref Quaterniond quat, out Vector3d result)
         {
-            Quaterniond v = new Quaterniond(vec.X, vec.Y, vec.Z, 0);
-            Quaterniond i;
-            Quaterniond t;
+            Quaterniond v = new Quaterniond(vec.X, vec.Y, vec.Z, 0), i, t;
             Quaterniond.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaterniond.Multiply(ref quat, ref v, out t);
+            Quaterniond.Multiply(ref t, ref i, out v);
 
             result = new Vector3d(v.X, v.Y, v.Z);
         }
diff --git a/Source/OpenTK/Math/Vector4.cs b/Source/OpenTK/Math/Vector4.cs
index 0994241b..f13a6fe0 100644
--- a/Source/OpenTK/Math/Vector4.cs
+++ b/Source/OpenTK/Math/Vector4.cs
@@ -963,12 +963,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector4 vec, ref Quaternion quat, out Vector4 result)
         {
-            Quaternion v = new Quaternion(vec.X, vec.Y, vec.Z, vec.W);
-            Quaternion i;
-            Quaternion t;
+            Quaternion v = new Quaternion(vec.X, vec.Y, vec.Z, vec.W), i, t;
             Quaternion.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaternion.Multiply(ref quat, ref v, out t);
+            Quaternion.Multiply(ref t, ref i, out v);
 
             result = new Vector4(v.X, v.Y, v.Z, v.W);
         }
diff --git a/Source/OpenTK/Math/Vector4d.cs b/Source/OpenTK/Math/Vector4d.cs
index 9cfe2c98..abe6d164 100644
--- a/Source/OpenTK/Math/Vector4d.cs
+++ b/Source/OpenTK/Math/Vector4d.cs
@@ -966,12 +966,10 @@ namespace OpenTK
         /// <param name="result">The result of the operation.</param>
         public static void Transform(ref Vector4d vec, ref Quaterniond quat, out Vector4d result)
         {
-            Quaterniond v = new Quaterniond(vec.X, vec.Y, vec.Z, vec.W);
-            Quaterniond i;
-            Quaterniond t;
+            Quaterniond v = new Quaterniond(vec.X, vec.Y, vec.Z, vec.W), i, t;
             Quaterniond.Invert(ref quat, out i);
-            t = i * v;
-            v = t * quat;
+            Quaterniond.Multiply(ref quat, ref v, out t);
+            Quaterniond.Multiply(ref t, ref i, out v);
 
             result = new Vector4d(v.X, v.Y, v.Z, v.W);
         }