diff --git a/src/daq/caen/n1081b.py b/src/daq/caen/n1081b.py
index 36b5b37..343023f 100644
--- a/src/daq/caen/n1081b.py
+++ b/src/daq/caen/n1081b.py
@@ -88,7 +88,7 @@ def _poll_sections(self):
     def _send_store_message(self, data: dict, section):
         keys = ["timestamp", *[f"lemo_{x['lemo']}" for x in data["counters"]]]
         values = [
-            datetime.now().timestamp(),
+            int(datetime.now().timestamp() * 1000),  # unix timestamp in milliseconds
             *[x["value"] for x in data["counters"]],
         ]
         self.message_out.put(