diff --git a/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs b/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
index 8b58458887..cd0d0ce534 100644
--- a/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
+++ b/BizHawk.Client.EmuHawk/DisplayManager/Filters/Gui.cs
@@ -388,7 +388,7 @@ namespace BizHawk.Client.EmuHawk.Filters
 			if (renderTop)
 			{
 				GuiRenderer.Modelview.Push();
-				GuiRenderer.Modelview.PostMultiplyMatrix(matTop);
+				GuiRenderer.Modelview.PreMultiplyMatrix(matTop);
 				GuiRenderer.DrawSubrect(InputTexture, 0, 0, 256, 192, 0.0f, 0.0f, 1.0f, 0.5f);
 				GuiRenderer.Modelview.Pop();
 			}
@@ -396,7 +396,7 @@ namespace BizHawk.Client.EmuHawk.Filters
 			if (renderBottom)
 			{
 				GuiRenderer.Modelview.Push();
-				GuiRenderer.Modelview.PostMultiplyMatrix(matBot);
+				GuiRenderer.Modelview.PreMultiplyMatrix(matBot);
 				GuiRenderer.DrawSubrect(InputTexture, 0, 0, 256, 192, 0.0f, 0.5f, 1.0f, 1.0f);
 				GuiRenderer.Modelview.Pop();
 			}
diff --git a/Bizware/BizHawk.Bizware.BizwareGL/MatrixStack.cs b/Bizware/BizHawk.Bizware.BizwareGL/MatrixStack.cs
index 123de5d164..2590f0db56 100644
--- a/Bizware/BizHawk.Bizware.BizwareGL/MatrixStack.cs
+++ b/Bizware/BizHawk.Bizware.BizwareGL/MatrixStack.cs
@@ -83,7 +83,7 @@ namespace BizHawk.Bizware.BizwareGL
 		public void Translate(Point pt) { Translate(pt.X, pt.Y, 0); IsDirty = true; }
 
 		public void PostMultiplyMatrix(MatrixStack ms) { PostMultiplyMatrix(ms.Top); IsDirty = true; }
-		public void PostMultiplyMatrix(Matrix4 value) { Top = value * Top; IsDirty = true; }
-		public void PreMultiplyMatrix(Matrix4 value) { Top = Top * value; IsDirty = true; }
+		public void PostMultiplyMatrix(Matrix4 value) { Top = Top * value; IsDirty = true; }
+		public void PreMultiplyMatrix(Matrix4 value) { Top = value * Top; IsDirty = true; }
 	}
 }
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