diff --git a/Source/OpenTK/Graphics/ES20/Helper.cs b/Source/OpenTK/Graphics/ES20/Helper.cs
index f0046f36..a14bee80 100644
--- a/Source/OpenTK/Graphics/ES20/Helper.cs
+++ b/Source/OpenTK/Graphics/ES20/Helper.cs
@@ -137,6 +137,17 @@ namespace OpenTK.Graphics.ES20
             GL.Uniform4(location, quaternion.X, quaternion.Y, quaternion.Z, quaternion.W);
         }
 
+        public static void UniformMatrix3(int location, bool transpose, ref Matrix3 matrix)
+        {
+            unsafe
+            {
+                fixed (float* matrix_ptr = &matrix.Row0.X)
+                {
+                    GL.UniformMatrix3(location, 1, transpose, matrix_ptr);
+                }
+            }
+        }
+
         public static void UniformMatrix4(int location, bool transpose, ref Matrix4 matrix)
         {
             unsafe
diff --git a/Source/OpenTK/Graphics/OpenGL/GLHelper.cs b/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
index 6e071871..b90f81fe 100644
--- a/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
+++ b/Source/OpenTK/Graphics/OpenGL/GLHelper.cs
@@ -300,17 +300,6 @@ namespace OpenTK.Graphics.OpenGL
             }
         }
 
-        public static void UniformMatrix4(int location, bool transpose, ref Matrix4 matrix)
-        {
-            unsafe
-            {
-                fixed (float* matrix_ptr = &matrix.Row0.X)
-                {
-                    GL.UniformMatrix4(location, 1, transpose, matrix_ptr);
-                }
-            }
-        }
-
         public static void Normal3(Vector3d normal)
         {
             GL.Normal3(normal.X, normal.Y, normal.Z);
@@ -465,6 +454,50 @@ namespace OpenTK.Graphics.OpenGL
             GL.Uniform4(location, quaternion.X, quaternion.Y, quaternion.Z, quaternion.W);
         }
 
+        public static void UniformMatrix3(int location, bool transpose, ref Matrix3 matrix)
+        {
+            unsafe
+            {
+                fixed (float* matrix_ptr = &matrix.Row0.X)
+                {
+                    GL.UniformMatrix3(location, 1, transpose, matrix_ptr);
+                }
+            }
+        }
+
+        public static void UniformMatrix3(int location, bool transpose, ref Matrix3d matrix)
+        {
+            unsafe
+            {
+                fixed (double* matrix_ptr = &matrix.Row0.X)
+                {
+                    GL.UniformMatrix3(location, 1, transpose, matrix_ptr);
+                }
+            }
+        }
+
+        public static void UniformMatrix4(int location, bool transpose, ref Matrix4 matrix)
+        {
+            unsafe
+            {
+                fixed (float* matrix_ptr = &matrix.Row0.X)
+                {
+                    GL.UniformMatrix4(location, 1, transpose, matrix_ptr);
+                }
+            }
+        }
+
+        public static void UniformMatrix4(int location, bool transpose, ref Matrix4d matrix)
+        {
+            unsafe
+            {
+                fixed (double* matrix_ptr = &matrix.Row0.X)
+                {
+                    GL.UniformMatrix4(location, 1, transpose, matrix_ptr);
+                }
+            }
+        }
+
         #endregion
 
         #endregion
diff --git a/Source/OpenTK/OpenTK.csproj b/Source/OpenTK/OpenTK.csproj
index d794c9b4..605d0c6b 100644
--- a/Source/OpenTK/OpenTK.csproj
+++ b/Source/OpenTK/OpenTK.csproj
@@ -132,6 +132,7 @@
     <Compile Include="Input\IInputDriver2.cs" />
     <Compile Include="Input\IKeyboardDriver2.cs" />
     <Compile Include="Input\IMouseDriver2.cs" />
+    <Compile Include="Math\Matrix3.cs" />
     <Compile Include="Platform\DisplayDeviceBase.cs" />
     <Compile Include="Platform\Windows\WinInputBase.cs" />
     <Compile Include="WindowBorder.cs">