diff --git a/du3/program.c b/du3/program.c
index dc6abaf..1b646bb 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -79,7 +79,7 @@ int main(){
         }
         else{
             printf("bad input\n");
-            return 1;
+            return 0;
         }
         print_s(&mystack);
     }