diff --git a/system/system/system.c b/system/system/system.c
index ca827a3fc..82423034e 100644
--- a/system/system/system.c
+++ b/system/system/system.c
@@ -30,6 +30,7 @@
 #include <spawn.h>
 #include <assert.h>
 #include <debug.h>
+#include <errno.h>
 
 #include "nshlib/nshlib.h"