diff --git a/photon/libc/stdlib/abort.c b/photon/libc/stdlib/abort.c
index f146059..75fc9a8 100644
--- a/photon/libc/stdlib/abort.c
+++ b/photon/libc/stdlib/abort.c
@@ -1,8 +1,9 @@
 #include <stdlib.h>
+#include <unistd.h>
 #include <stdio.h>
 
 _Noreturn void abort(void)
 {
-    fprintf(stderr, "Aborted.\n");
+    fprintf(stderr, " ** [%d] abort\n", getpid());
     exit(-1);
 }