diff --git a/lib/syslib/panic.c b/lib/syslib/panic.c
index a40cab8ae..0128c9e04 100644
--- a/lib/syslib/panic.c
+++ b/lib/syslib/panic.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <signal.h>
+#include <unistd.h>
 #include <minix/sysutil.h>
 
 #include "syslib.h"