diff --git a/browser/branding/aurora/Makefile.in b/browser/branding/aurora/Makefile.in
index 1e70ca2c78ad..573a6d197861 100644
--- a/browser/branding/aurora/Makefile.in
+++ b/browser/branding/aurora/Makefile.in
@@ -37,7 +37,7 @@ BRANDING_FILES := \
 	$(NULL)
 endif
 
-ifeq ($(MOZ_WIDGET_TOOLKIT),gtk2)
+ifdef MOZ_WIDGET_GTK
 BRANDING_FILES := \
 	default16.png \
 	default32.png \
diff --git a/browser/branding/official/Makefile.in b/browser/branding/official/Makefile.in
index 1e70ca2c78ad..573a6d197861 100644
--- a/browser/branding/official/Makefile.in
+++ b/browser/branding/official/Makefile.in
@@ -37,7 +37,7 @@ BRANDING_FILES := \
 	$(NULL)
 endif
 
-ifeq ($(MOZ_WIDGET_TOOLKIT),gtk2)
+ifdef MOZ_WIDGET_GTK
 BRANDING_FILES := \
 	default16.png \
 	default32.png \