diff --git a/include/linux/key.h b/include/linux/key.h
index 33e0165..cd50dfa 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -278,6 +278,8 @@
 extern ctl_table key_sysctls[];
 #endif
 
+extern void key_replace_session_keyring(void);
+
 /*
  * the userspace interface
  */
@@ -300,6 +302,7 @@
 #define key_fsuid_changed(t)		do { } while(0)
 #define key_fsgid_changed(t)		do { } while(0)
 #define key_init()			do { } while(0)
+#define key_replace_session_keyring()	do { } while(0)
 
 #endif /* CONFIG_KEYS */
 #endif /* __KERNEL__ */