diff --git a/include/linux/ns_common.h b/include/linux/ns_common.h
index 5fbc4000358f15dbd57e9d42ae9c7472c3ea49fa..0f1d024bd9582618a54b601988969694b4dafb47 100644
--- a/include/linux/ns_common.h
+++ b/include/linux/ns_common.h
@@ -2,12 +2,15 @@
 #ifndef _LINUX_NS_COMMON_H
 #define _LINUX_NS_COMMON_H
 
+#include <linux/refcount.h>
+
 struct proc_ns_operations;
 
 struct ns_common {
 	atomic_long_t stashed;
 	const struct proc_ns_operations *ops;
 	unsigned int inum;
+	refcount_t count;
 };
 
 #endif