1 files changed, 1 insertions, 0 deletions

diff --git a/coreutils/sync.c b/coreutils/sync.c
index 8f101cf17..f95c24c6c 100644
--- a/coreutils/sync.c
+++ b/coreutils/sync.c
@@ -23,6 +23,7 @@
 
 #include "busybox.h"
 #include <stdio.h>
+#include <unistd.h>
 
 extern int sync_main(int argc, char **argv)
 {