diff --git a/commands/simple/mount.c b/commands/simple/mount.c
index 7f0aef6b2..911407bf3 100755
--- a/commands/simple/mount.c
+++ b/commands/simple/mount.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <dirent.h>
 #include <string.h>
+#include <unistd.h>
 #include <sys/mount.h>
 #include <fcntl.h>
 #include <minix/config.h>