diff --git a/plugins/GSdx/res/glsl/tfx_fs.glsl b/plugins/GSdx/res/glsl/tfx_fs.glsl
index b44e521a7c..2168f6a376 100644
--- a/plugins/GSdx/res/glsl/tfx_fs.glsl
+++ b/plugins/GSdx/res/glsl/tfx_fs.glsl
@@ -395,7 +395,7 @@ void ps_fbmask(inout vec4 C)
 	// FIXME do I need special case for 16 bits
 #if PS_FBMASK
 	vec4 RT = trunc(texelFetch(RtSampler, ivec2(gl_FragCoord.xy), 0) * 255.0f + 0.1f);
-	C = vec4((uvec4(C) & ~FbMask) | (uvec4(RT) & FbMask)) / 255.0f;
+	C = vec4((uvec4(C) & ~FbMask) | (uvec4(RT) & FbMask));
 #endif
 }
 
diff --git a/plugins/GSdx/res/glsl_source.h b/plugins/GSdx/res/glsl_source.h
index 6abda2c6f9..8cc8ba7a03 100644
--- a/plugins/GSdx/res/glsl_source.h
+++ b/plugins/GSdx/res/glsl_source.h
@@ -1258,7 +1258,7 @@ static const char* tfx_fs_all_glsl =
 	"	// FIXME do I need special case for 16 bits\n"
 	"#if PS_FBMASK\n"
 	"	vec4 RT = trunc(texelFetch(RtSampler, ivec2(gl_FragCoord.xy), 0) * 255.0f + 0.1f);\n"
-	"	C = vec4((uvec4(C) & ~FbMask) | (uvec4(RT) & FbMask)) / 255.0f;\n"
+	"	C = vec4((uvec4(C) & ~FbMask) | (uvec4(RT) & FbMask));\n"
 	"#endif\n"
 	"}\n"
 	"\n"