diff --git a/Game/Game.cs b/Game/Game.cs
index b1e0f023e..94fe213f7 100644
--- a/Game/Game.cs
+++ b/Game/Game.cs
@@ -10,7 +10,6 @@ using ClassicalSharp.Particles;
 using ClassicalSharp.Renderers;
 using ClassicalSharp.Selections;
 using OpenTK;
-using OpenTK.Graphics.OpenGL;
 using OpenTK.Input;
 
 namespace ClassicalSharp {
@@ -328,7 +327,7 @@ namespace ClassicalSharp {
 		
 		protected override void OnResize( EventArgs e ) {
 			base.OnResize( e );
-			GL.Viewport( ClientRectangle );
+			Graphics.OnWindowResize( Width, Height );
 			UpdateProjection();
 			if( activeScreen != null ) {
 				activeScreen.OnResize( width, height, Width, Height );
diff --git a/GraphicsAPI/IGraphicsApi.cs b/GraphicsAPI/IGraphicsApi.cs
index 5e53456c7..c8fa532aa 100644
--- a/GraphicsAPI/IGraphicsApi.cs
+++ b/GraphicsAPI/IGraphicsApi.cs
@@ -196,6 +196,8 @@ namespace ClassicalSharp.GraphicsAPI {
 		public virtual void PrintApiSpecificInfo() {
 		}
 		
+		public abstract void OnWindowResize( int newWidth, int newHeight );
+		
 		public virtual void Draw2DQuad( float x, float y, float width, float height, FastColour col ) {
 			VertexPos3fCol4b[] vertices = {
 				new VertexPos3fCol4b( x + width, y, 0, col ),
diff --git a/GraphicsAPI/OpenGLApi.cs b/GraphicsAPI/OpenGLApi.cs
index 04ddb88ca..b9109f6d9 100644
--- a/GraphicsAPI/OpenGLApi.cs
+++ b/GraphicsAPI/OpenGLApi.cs
@@ -618,6 +618,9 @@ namespace ClassicalSharp.GraphicsAPI {
 			}
 		}
 		
+		public override void OnWindowResize( int newWidth, int newHeight ) {
+			GL.Viewport( 0, 0, newWidth, newHeight );
+		}
 
 		public Color4 GetCol() {
 			float[] col = new float[4];