diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 2a17fd9..030250c 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -11,6 +11,7 @@
 #include <net/net_namespace.h>
 #include <linux/ipc_namespace.h>
 #include <linux/pid_namespace.h>
+#include <linux/user_namespace.h>
 #include "internal.h"
 
 
@@ -27,6 +28,9 @@
 #ifdef CONFIG_PID_NS
 	&pidns_operations,
 #endif
+#ifdef CONFIG_USER_NS
+	&userns_operations,
+#endif
 	&mntns_operations,
 };