diff --git a/ipc/util.h b/ipc/util.h
index ab3ebf2621b9c9e725aab9dce32f5ad395063547..764b51a37a6ad352ad6d1f12a1016749a3bbc1a7 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -10,6 +10,7 @@
 #ifndef _IPC_UTIL_H
 #define _IPC_UTIL_H
 
+#include <linux/unistd.h>
 #include <linux/err.h>
 
 #define SEQ_MULTIPLIER	(IPCMNI)