diff --git a/dap/accumulator.py b/dap/accumulator.py
index 85017df..13f4e15 100644
--- a/dap/accumulator.py
+++ b/dap/accumulator.py
@@ -76,7 +76,7 @@ def accumulate(accumulator_addr, bsread_port):
         for pulse_id, data in ready:
             timestamp = results["timestamp"]
             timestamp = make_bsread_timestamp(timestamp, pulse_id)
-            data["bsread_timestamp_secs"] = data["bsread_timestamp_nanos"] = timestamp
+            data["bsread_timestamp_secs"], data["bsread_timestamp_nanos"] = timestamp
             sender.send(pulse_id=pulse_id, data=data, timestamp=timestamp)