diff --git a/sf_daq_broker/writer/epics_writer.py b/sf_daq_broker/writer/epics_writer.py
index 862b2b0..41e615e 100644
--- a/sf_daq_broker/writer/epics_writer.py
+++ b/sf_daq_broker/writer/epics_writer.py
@@ -77,7 +77,7 @@ class EpicsH5Writer(BsreadH5Writer):
         for channel_data in raw_data:
             channel_name = channel_data["channel"]["name"]
 
-            timestamp_data = [int(x["globalSeconds"])*(10**9) for x in channel_data["data"]]
+            timestamp_data = [int(float(x["globalSeconds"])*(10**9)) for x in channel_data["data"]]
             value_data = [x["value"] for x in channel_data["data"]]
             type_data = [x["type"] for x in channel_data["data"]]
             shape_data = [x["shape"] for x in channel_data["data"]]