diff --git a/src/gl/scene/gl_flats.cpp b/src/gl/scene/gl_flats.cpp
index 950a74cff..361b920e9 100644
--- a/src/gl/scene/gl_flats.cpp
+++ b/src/gl/scene/gl_flats.cpp
@@ -174,6 +174,7 @@ void FDrawInfo::DrawSubsectors(GLFlat *flat, int pass, bool processlights, bool
 	int dli = flat->dynlightindex;
 
 	gl_RenderState.Apply();
+	if (gl.legacyMode) processlights = false;
 	if (flat->vboindex >= 0)
 	{
 		int index = flat->vboindex;