diff --git a/mm/slab.c b/mm/slab.c
index 202465a193c1..2e338a5f7b14 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4475,3 +4475,4 @@ size_t ksize(const void *objp)
 
 	return obj_size(virt_to_cache(objp));
 }
+EXPORT_SYMBOL(ksize);
diff --git a/mm/slob.c b/mm/slob.c
index 08a9bd91a1aa..ee2ef8af0d43 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -495,6 +495,7 @@ size_t ksize(const void *block)
 	else
 		return sp->page.private;
 }
+EXPORT_SYMBOL(ksize);
 
 struct kmem_cache {
 	unsigned int size, align;