diff --git a/wadsrc/static/shaders/glsl/main.fp b/wadsrc/static/shaders/glsl/main.fp
index bc2f84ea76..63b92bd7e3 100644
--- a/wadsrc/static/shaders/glsl/main.fp
+++ b/wadsrc/static/shaders/glsl/main.fp
@@ -565,7 +565,7 @@ void SetMaterialProps(inout Material material, vec2 texCoord)
 // OpenGL doesn't care, but Vulkan pukes all over the place if these texture samplings are included in no-texture shaders, even though never called.
 #ifndef NO_LAYERS
 	if ((uTextureMode & TEXF_Brightmap) != 0)
-		material.Bright = texture(brighttexture, texCoord.st);
+		material.Bright = desaturate(texture(brighttexture, texCoord.st));
 		
 	if ((uTextureMode & TEXF_Detailmap) != 0)
 	{
@@ -574,7 +574,7 @@ void SetMaterialProps(inout Material material, vec2 texCoord)
 	}
 	
 	if ((uTextureMode & TEXF_Glowmap) != 0)
-		material.Glow = texture(glowtexture, texCoord.st);
+		material.Glow = desaturate(texture(glowtexture, texCoord.st));
 #endif
 }