diff --git a/du3/program.c b/du3/program.c
index 38051a5..cece3e6 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -86,7 +86,7 @@ int main(void) {
                 case '/':
                     if (b == 0) {
                         printf("division by zero\n");
-                        return 1;
+                        return 0;
                     }
                     result = a / b; break;
                 default: