diff --git a/user/app_alloc0.c b/user/app_alloc0.c
index 6e491c9..d5bb1ed 100644
--- a/user/app_alloc0.c
+++ b/user/app_alloc0.c
@@ -16,9 +16,9 @@ int main(void) {
 
   for (int i = 0; i < N; i++) {
     int *pi = p[i];
-    printu("=== user0: %d\n", *pi);
+    printu("=== user 0: %d\n", *pi);
     naive_free(p[i]);
   }
 
   exit(0);
-}
\ No newline at end of file
+}