diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index faa2a521dea321f6b8a2b19d1b3ac4b2ad245044..d3a9c5368257afd6243c81c26881b25f67ff65f4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -311,7 +311,7 @@ struct vm_struct *remove_vm_area(void *addr)
 	return v;
 }
 
-void __vunmap(void *addr, int deallocate_pages)
+static void __vunmap(void *addr, int deallocate_pages)
 {
 	struct vm_struct *area;