diff --git a/parser/html/moz.build b/parser/html/moz.build
index 2b351f0843..4a2da8a790 100644
--- a/parser/html/moz.build
+++ b/parser/html/moz.build
@@ -98,7 +98,6 @@ LOCAL_INCLUDES += [
     '/dom/base',
 ]
 
-if CONFIG['GNU_CXX']:
-    CXXFLAGS += ['-Wno-error=shadow']
-    if CONFIG['CLANG_CXX']:
-        CXXFLAGS += ['-Wno-implicit-fallthrough']
+if CONFIG['GNU_CXX'] or CONFIG['CLANG_CXX']:
+    CXXFLAGS += ['-Wno-error=shadow',
+                 '-Wno-implicit-fallthrough']