diff --git a/dap/accumulator.py b/dap/accumulator.py
index e366e7f..cc0e7b3 100644
--- a/dap/accumulator.py
+++ b/dap/accumulator.py
@@ -2,7 +2,7 @@ import argparse
 
 from bsread.sender import Sender, PUB
 
-from utils import FileHandler, Sorter, make_bsread_timestamp
+from utils import FileHandler, Sorter
 from zmqsocks import ZMQSocketsAccumulator, make_address
 
 
@@ -60,9 +60,9 @@ def accumulate(accumulator_addr, bsread_port):
         if not bsread_port:
             continue
 
+        timestamp = results["timestamp"]
+
         to_copy = (
-            "pulse_id",
-            "timestamp",
             "frame",
             "is_good_frame",
             "number_of_spots",
@@ -71,13 +71,10 @@ def accumulate(accumulator_addr, bsread_port):
 
         data = {f"{detector}:{k}": results[k] for k in to_copy}
 
-        sorter.add(pulse_id, data)
+        sorter.add(pulse_id, (timestamp, data))
         ready = sorter.flush_ready()
-        for pulse_id, data in ready:
-            timestamp = results["timestamp"]
-            timestamp = make_bsread_timestamp(timestamp, pulse_id)
-            data[f"{detector}:bsread_timestamp_secs"], data[f"{detector}:bsread_timestamp_nanos"] = timestamp
-            sender.send(pulse_id=pulse_id, data=data, timestamp=timestamp)
+        for pulse_id, (timestamp, data) in ready:
+            sender.send(pulse_id=pulse_id, timestamp=timestamp, data=data)
 
 
 
diff --git a/dap/worker.py b/dap/worker.py
index 98794cd..67a63de 100644
--- a/dap/worker.py
+++ b/dap/worker.py
@@ -7,7 +7,7 @@ from algos import (
     calc_apply_aggregation, calc_apply_threshold, calc_mask_pixels, calc_peakfinder_analysis,
     calc_radial_integration, calc_roi, calc_spi_analysis, calc_streakfinder_analysis, JFData
 )
-from utils import Aggregator, BufferedJSON, randskip, read_bit
+from utils import Aggregator, BufferedJSON, make_bsread_timestamp, randskip, read_bit
 from zmqsocks import ZMQSocketsWorker, make_address
 
 
@@ -74,7 +74,7 @@ def work(backend_addr, accumulator_addr, visualisation_addr, fn_peakfinder_param
         results = metadata.copy()
         results.update(peakfinder_parameters)
 
-        results["timestamp"] = timestamp
+        results["timestamp"] = make_bsread_timestamp(timestamp, pulse_id)
         results["number_of_spots"] = 0
         results["is_hit_frame"] = False