diff --git a/libtransmission/verify.cc b/libtransmission/verify.cc
index 0dcfc0570..466fc4975 100644
--- a/libtransmission/verify.cc
+++ b/libtransmission/verify.cc
@@ -34,7 +34,7 @@ auto constexpr SleepPerSecondDuringVerify = 100ms;
 }
 } // namespace
 
-void tr_verify_worker::verify_torrent(Mediator& verify_mediator, bool const abort_flag)
+void tr_verify_worker::verify_torrent(Mediator& verify_mediator, std::atomic<bool> const& abort_flag)
 {
     verify_mediator.on_verify_started();
 
diff --git a/libtransmission/verify.h b/libtransmission/verify.h
index 9c20b65dc..1790a6c5f 100644
--- a/libtransmission/verify.h
+++ b/libtransmission/verify.h
@@ -72,7 +72,7 @@ private:
         tr_priority_t priority_;
     };
 
-    static void verify_torrent(Mediator& verify_mediator, bool abort_flag);
+    static void verify_torrent(Mediator& verify_mediator, std::atomic<bool> const& abort_flag);
 
     void verify_thread_func();