diff --git a/src_assets/linux/assets/shaders/opengl/ConvertY.frag b/src_assets/linux/assets/shaders/opengl/ConvertY.frag
index dfd5774e9..272e4cd44 100644
--- a/src_assets/linux/assets/shaders/opengl/ConvertY.frag
+++ b/src_assets/linux/assets/shaders/opengl/ConvertY.frag
@@ -20,7 +20,7 @@ layout(location = 0) out float color;
 void main()
 {
 	vec3 rgb = texture(image, tex).rgb;
-	float y = dot(color_vec_y.xyz, rgb);
+	float y = dot(color_vec_y.xyz, rgb) + color_vec_y.w;
 
 	color = y * range_y.x + range_y.y;
 }
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