diff --git a/dap/accumulator.py b/dap/accumulator.py
index 43e4a88..689d715 100644
--- a/dap/accumulator.py
+++ b/dap/accumulator.py
@@ -51,7 +51,7 @@ def accumulate(accumulator_host, accumulator_port):
         res_laser_on        = results.get("laser_on", False)
         res_roi_intensities = results.get("roi_intensities", [])
 
-        print(pulse_id, res_is_good_frame, res_is_hit_frame, res_number_of_spots, res_laser_on, *res_roi_intensities, file=output_dap)
+        print(pulse_id, res_is_good_frame, res_is_hit_frame, res_number_of_spots, res_laser_on, *res_roi_intensities, file=output_dap.file)