diff --git a/du3/program.c b/du3/program.c
index 8a5a40d..6afb22e 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -70,7 +70,7 @@ int main() {
          char *endptr;
          float val = strtof(input, &endptr);
          if (*endptr != '\0') {
-            printf("no input\n");
+            printf("bad input\n");
             exit(0);
          }
          push_stack(&s, val);