diff --git a/ast_expr.y b/ast_expr.y
index 97b2b021cf..71546f1b0b 100755
--- a/ast_expr.y
+++ b/ast_expr.y
@@ -215,6 +215,8 @@ struct val *vp;
 	}
 	if (vp->type == string || vp->type == numeric_string)
 		free (vp->u.s);	
+	if (vp)
+		free (vp);
 }