diff --git a/src/uct/api/v2/uct_v2.h b/src/uct/api/v2/uct_v2.h
index cfc7c5deef2..89b4ed68e3f 100644
--- a/src/uct/api/v2/uct_v2.h
+++ b/src/uct/api/v2/uct_v2.h
@@ -1916,8 +1916,12 @@ typedef struct uct_ep_op_info {
 /**
  * @ingroup UCT_RESOURCE
  * @brief Callback invoked for each undelivered outstanding operation.
+ *
+ * @return @ref UCS_OK         - The purged operation was handled successfully.
+ *         Otherwise           - The purged operation was handled with error
+ *                               and returned back to the transport.
  */
-typedef void (*uct_ep_outstanding_purge_callback_t)(
+typedef ucs_status_t (*uct_ep_outstanding_purge_callback_t)(
         const uct_ep_op_info_t *op_info, void *arg);
 
 
diff --git a/test/gtest/uct/ib/test_ib_mlx5_ext.cc b/test/gtest/uct/ib/test_ib_mlx5_ext.cc
index 0f747b40b45..e2f8692132e 100644
--- a/test/gtest/uct/ib/test_ib_mlx5_ext.cc
+++ b/test/gtest/uct/ib/test_ib_mlx5_ext.cc
@@ -73,9 +73,10 @@ class test_uct_ib_mlx5_ext_rc : public test_rc {
         return UCS_OK;
     }
 
-    static void purge_cb(const uct_ep_op_info_t*, void *arg)
+    static ucs_status_t purge_cb(const uct_ep_op_info_t*, void *arg)
     {
         *static_cast<bool*>(arg) = true;
+        return UCS_OK;
     }
 
     static void