diff --git a/include/linux/printk.h b/include/linux/printk.h
index b772ca5..9adfba6 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -83,6 +83,7 @@
 
 extern int printk_delay_msec;
 extern int dmesg_restrict;
+extern int kptr_restrict;
 
 /*
  * Print a one-time message (analogous to WARN_ONCE() et al):