diff --git a/indra/newview/lldrawpoolalpha.cpp b/indra/newview/lldrawpoolalpha.cpp
index 3d88b34ca..b27bb9a14 100644
--- a/indra/newview/lldrawpoolalpha.cpp
+++ b/indra/newview/lldrawpoolalpha.cpp
@@ -446,7 +446,7 @@ void LLDrawPoolAlpha::renderAlpha(U32 mask, S32 pass)
 					llassert_always(!LLGLSLShader::sCurBoundShaderPtr);
 
 					bool fullbright = depth_only || params.mFullbright;
-					if(fullbright == light_enabled || !initialized_lighting)
+					if(fullbright == !!light_enabled || !initialized_lighting)
 					{
 						light_enabled = !fullbright;
 						initialized_lighting = true;