diff --git a/ydb/core/tx/datashard/datashard_ut_change_exchange.cpp b/ydb/core/tx/datashard/datashard_ut_change_exchange.cpp
index 9d16bd2587d1..518740f0d9bf 100644
--- a/ydb/core/tx/datashard/datashard_ut_change_exchange.cpp
+++ b/ydb/core/tx/datashard/datashard_ut_change_exchange.cpp
@@ -3657,7 +3657,7 @@ Y_UNIT_TEST_SUITE(Cdc) {
         });
 
         ui32 splitResponses = 0;
-        auto countSplitResponses = runtime.AddObserver<TEvPersQueue::TEvResponse>([&](auto& ev) {
+        auto countSplitResponses = runtime.AddObserver<TEvPersQueue::TEvResponse>([&](auto&) {
             ++splitResponses;
         });