diff --git a/mm/mmap.c b/mm/mmap.c
index 590df3862840..143d62f5fc5c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2672,6 +2672,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 
 	return 0;
 }
+EXPORT_SYMBOL(do_munmap);
 
 int vm_munmap(unsigned long start, size_t len)
 {