diff --git a/src/ucs/datastruct/mpool.inl b/src/ucs/datastruct/mpool.inl
index d06e2f9..6b32406 100644
--- a/src/ucs/datastruct/mpool.inl
+++ b/src/ucs/datastruct/mpool.inl
@@ -71,7 +71,7 @@ static inline ucs_mpool_t *ucs_mpool_obj_owner(void *obj)
 
 static inline void ucs_mpool_put_inline(void *obj)
 {
-    ucs_mpool_elem_t *elem;
+    ucs_mpool_elem_t * volatile elem;
     ucs_mpool_t *mp;
 
     elem = ucs_mpool_obj_to_elem(obj);