diff --git a/tools/widl/parser.y b/tools/widl/parser.y
index 0f22c65099f..46418a33049 100644
--- a/tools/widl/parser.y
+++ b/tools/widl/parser.y
@@ -63,6 +63,8 @@
 # endif
 #endif
 
+#define YYERROR_VERBOSE
+
 unsigned char pointer_default = RPC_FC_UP;
 static int is_object_interface = FALSE;