diff --git a/Documentation/sharedsubtree.txt b/Documentation/sharedsubtree.txt
index ccf1cebe744f8b4a6901ff7f61bd23029562344a..736540045dc7b7c9e448fb90bd72fc63346e082d 100644
--- a/Documentation/sharedsubtree.txt
+++ b/Documentation/sharedsubtree.txt
@@ -153,6 +153,7 @@ replicas continue to be exactly same.
 	#include <stdio.h>
 	#include <stdlib.h>
 	#include <unistd.h>
+	#include <string.h>
 	#include <sys/mount.h>
 	#include <sys/fsuid.h>