diff --git a/GPU/Directx9/ShaderManagerDX9.cpp b/GPU/Directx9/ShaderManagerDX9.cpp
index d02b8c7982..c1243b2f4f 100644
--- a/GPU/Directx9/ShaderManagerDX9.cpp
+++ b/GPU/Directx9/ShaderManagerDX9.cpp
@@ -255,6 +255,11 @@ static void ConvertProjMatrixToD3D(Matrix4x4 &in, bool invertedX, bool invertedY
 	float yoff = -0.5f / gstate_c.curRTRenderHeight;
 	yoff = gstate_c.vpYOffset + (invertedY ? yoff : -yoff);
 
+	if (invertedX)
+		xoff = -xoff;
+	if (invertedY)
+		yoff = -yoff;
+
 	in.translateAndScale(Vec3(xoff, yoff, 0.5f), Vec3(gstate_c.vpWidthScale, gstate_c.vpHeightScale, invertedZ ? -0.5 : 0.5f));
 }