diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index faa2a52..d3a9c53 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -311,7 +311,7 @@
 	return v;
 }
 
-void __vunmap(void *addr, int deallocate_pages)
+static void __vunmap(void *addr, int deallocate_pages)
 {
 	struct vm_struct *area;