diff --git a/wadsrc/static/shaders/glsl/main.fp b/wadsrc/static/shaders/glsl/main.fp
index a90141d0d..ddd1f1439 100644
--- a/wadsrc/static/shaders/glsl/main.fp
+++ b/wadsrc/static/shaders/glsl/main.fp
@@ -504,7 +504,7 @@ void main()
 		
 		case 4:	// simple 2D (reuses a uniform for the special colormap for the color overlay.)
 		{
-			frag = frag * vColor;
+			frag = frag * ProcessLight(vColor);
 			frag.rgb = frag.rgb + uFixedColormapStart.rgb;
 			break;
 		}