diff --git a/mtdutils/mounts.c b/mtdutils/mounts.c
index c90fc8ac..cd3738a0 100644
--- a/mtdutils/mounts.c
+++ b/mtdutils/mounts.c
@@ -19,6 +19,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <unistd.h>
 #include <sys/mount.h>
 
 #include "mounts.h"