diff --git a/broker/JFJochStateMachine.cpp b/broker/JFJochStateMachine.cpp
index 811c1def..079e6751 100644
--- a/broker/JFJochStateMachine.cpp
+++ b/broker/JFJochStateMachine.cpp
@@ -132,6 +132,8 @@ void JFJochStateMachine::TakeDarkMaskInternal(std::unique_lock<std::mutex> &ul)
     services.ConfigureDetector(local_experiment);
     services.Start(local_experiment, pixel_mask, nullptr);
 
+    services.Trigger();
+
     ul.unlock();
     // Allow to cancel/abort during the mask data collection
     auto mask_output = services.Stop();