diff --git a/layout/style/nsCSSPropList.h b/layout/style/nsCSSPropList.h
index 368b6f64b56..5989b572c97 100644
--- a/layout/style/nsCSSPropList.h
+++ b/layout/style/nsCSSPropList.h
@@ -3646,4 +3646,4 @@ CSS_PROP_TABLE(
 #undef DEFINED_CSS_PROP_SHORTHAND
 #endif
 
-#undef CSS_PROP_DOMPROP_PREFIXED(name_)
+#undef CSS_PROP_DOMPROP_PREFIXED