diff --git a/mm/rmap.c b/mm/rmap.c
index ed8889bf4ede..f79a206b271a 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1372,7 +1372,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
 	struct page *subpage;
 	bool ret = true;
 	struct mmu_notifier_range range;
-	enum ttu_flags flags = (enum ttu_flags)arg;
+	enum ttu_flags flags = (enum ttu_flags)(long)arg;
 
 	/* munlock has nothing to gain from examining un-locked vmas */
 	if ((flags & TTU_MUNLOCK) && !(vma->vm_flags & VM_LOCKED))