diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index dcaee24a4d87..47457048ab86 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -407,7 +407,6 @@ int register_pernet_device(struct pernet_operations *);
 void unregister_pernet_device(struct pernet_operations *);
 
 struct ctl_table;
-struct ctl_table_header;
 
 #ifdef CONFIG_SYSCTL
 int net_sysctl_init(void);