diff --git a/src/NukiOpenerWrapper.cpp b/src/NukiOpenerWrapper.cpp
index 0d7e620..36d203e 100644
--- a/src/NukiOpenerWrapper.cpp
+++ b/src/NukiOpenerWrapper.cpp
@@ -152,7 +152,7 @@ void NukiOpenerWrapper::update()
        (ts - lastReceivedBeaconTs > _restartBeaconTimeout * 1000))
     {
         Log->print("No BLE beacon received from the opener for ");
-        Log->print((millis() - lastReceivedBeaconTs) / 1000);
+        Log->print((ts - lastReceivedBeaconTs) / 1000);
         Log->println(" seconds, restarting device.");
         delay(200);
         restartEsp(RestartReason::BLEBeaconWatchdog);
diff --git a/src/NukiWrapper.cpp b/src/NukiWrapper.cpp
index b4f6a16..a46f2d4 100644
--- a/src/NukiWrapper.cpp
+++ b/src/NukiWrapper.cpp
@@ -180,7 +180,7 @@ void NukiWrapper::update()
        (ts - lastReceivedBeaconTs > _restartBeaconTimeout * 1000))
     {
         Log->print("No BLE beacon received from the lock for ");
-        Log->print((millis() - lastReceivedBeaconTs) / 1000);
+        Log->print((ts - lastReceivedBeaconTs) / 1000);
         Log->println(" seconds, restarting device.");
         delay(200);
         restartEsp(RestartReason::BLEBeaconWatchdog);