diff --git a/sys/vm/vm.h b/sys/vm/vm.h
index 710d85409b2..34ca2ea2eee 100644
--- a/sys/vm/vm.h
+++ b/sys/vm/vm.h
@@ -127,7 +127,7 @@ struct kva_md_info {
 };
 
 extern struct kva_md_info	kmi;
-extern void vm_ksubmap_init(struct kva_md_info *kmi);
+extern void vm_ksubmap_init(struct kva_md_info *);
 
 #endif				/* VM_H */