diff --git a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
index 31cad591be4b8dc935b476ba3122a366c49e6ee0..80816912daaad0b540c5edfc3d15ff5992596560 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
@@ -177,7 +177,7 @@ void main()
 
     diff.rgb = toneMap(diff.rgb);
 
-#if LEGACY_GAMMA
+#ifdef LEGACY_GAMMA
 #ifndef NO_POST
     diff.rgb = legacyGamma(diff.rgb);
 #endif