diff --git a/data/shaders/crtpi.glsl b/data/shaders/crtpi.glsl
index 068a6f1..a5cb4e4 100644
--- a/data/shaders/crtpi.glsl
+++ b/data/shaders/crtpi.glsl
@@ -97,7 +97,8 @@ void main()
 #if defined(CURVATURE)
 	screenScale = vec2(1.0, 1.0); //TextureSize / InputSize;
 #endif
-	filterWidth = (768.0 / 240.0) / 3.0;
+	//filterWidth = (768.0 / 240.0) / 3.0;
+	filterWidth = (768.0 / 256.0) / 3.0;
 	TEX0 = vec2(gl_MultiTexCoord0.x, 1.0-gl_MultiTexCoord0.y)*1.0001;
 	gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
 }
@@ -146,7 +147,7 @@ float CalcScanLine(float dy)
 
 void main()
 {
-	vec2 TextureSize = vec2(320.0, 240.0);
+	vec2 TextureSize = vec2(320.0, 256.0);
 #if defined(CURVATURE)
 	vec2 texcoord = Distort(TEX0);
 	if (texcoord.x < 0.0)