1 files changed, 2 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index 783689aa10..75b0cba312 100644
--- a/parse.y
+++ b/parse.y
@@ -1038,10 +1038,12 @@ arg		: lhs '=' arg
 		| primary_value tCOLON2 tCONSTANT tOP_ASGN arg
 		    {
 			yyerror("constant re-assignment");
+			$$ = 0;
 		    }
 		| tCOLON3 tCONSTANT tOP_ASGN arg
 		    {
 			yyerror("constant re-assignment");
+			$$ = 0;
 		    }
 		| backref tOP_ASGN arg
 		    {