diff --git a/tdutils/td/utils/MpscPollableQueue.h b/tdutils/td/utils/MpscPollableQueue.h
index 75499c248..f73794aed 100644
--- a/tdutils/td/utils/MpscPollableQueue.h
+++ b/tdutils/td/utils/MpscPollableQueue.h
@@ -44,6 +44,7 @@ class MpscPollableQueue {
       }
       event_fd_.acquire();
     }
+    UNREACHABLE();
   }
   ValueType reader_get_unsafe() {
     return std::move(reader_vector_[reader_pos_++]);