diff --git a/libc/upstream-dlmalloc/malloc.c b/libc/upstream-dlmalloc/malloc.c
index d951841..3ef9b61 100644
--- a/libc/upstream-dlmalloc/malloc.c
+++ b/libc/upstream-dlmalloc/malloc.c
@@ -3193,11 +3193,11 @@
 
   RELEASE_MALLOC_GLOBAL_LOCK();
   /* BEGIN android-added: move pthread_atfork outside of lock */
-#if LOCK_AT_FORK
   if (first_run != 0) {
+#if LOCK_AT_FORK
     pthread_atfork(&pre_fork, &post_fork_parent, &post_fork_child);
-  }
 #endif
+  }
   /* END android-added */
   return 1;
 }