diff --git a/src/listmode_buildblock/LmToProjData.cxx b/src/listmode_buildblock/LmToProjData.cxx
index edcce9519b..06b069481e 100644
--- a/src/listmode_buildblock/LmToProjData.cxx
+++ b/src/listmode_buildblock/LmToProjData.cxx
@@ -442,8 +442,9 @@ LmToProjData::set_up()
   else if (frame_defs.get_num_frames() < 1)
     {
       // make a single frame starting from 0. End value will be ignored.
-      vector<pair<double, double>> frame_times(1, pair<double, double>(0, 0));
-      frame_defs = TimeFrameDefinitions(frame_times);
+      frame_defs = lm_data_ptr->get_exam_info_sptr()->get_time_frame_definitions();
+      if (num_events_to_store!=0)
+          warning("A sub-sumple of the total events has been selected. The frame duration will be incorrect");
     }
 
   return Succeeded::yes;