diff --git a/src/gl/scene/gl_flats.cpp b/src/gl/scene/gl_flats.cpp
index 2fe139c62..4533041cb 100644
--- a/src/gl/scene/gl_flats.cpp
+++ b/src/gl/scene/gl_flats.cpp
@@ -56,6 +56,7 @@
 
 void FDrawInfo::SetupSubsectorLights(GLFlat *flat, int pass, subsector_t * sub, int *dli)
 {
+	if (FixedColormap != CM_DEFAULT) return;
 	if (dli != NULL && *dli != -1)
 	{
 		gl_RenderState.ApplyLightIndex(GLRenderer->mLights->GetIndex(*dli));
@@ -84,6 +85,7 @@ void FDrawInfo::SetupSubsectorLights(GLFlat *flat, int pass, subsector_t * sub,
 
 void FDrawInfo::SetupSectorLights(GLFlat *flat, int pass, int *dli)
 {
+	if (FixedColormap != CM_DEFAULT) return;
 	if (dli != NULL && *dli != -1)
 	{
 		gl_RenderState.ApplyLightIndex(GLRenderer->mLights->GetIndex(*dli));