diff --git a/rowers/dataprep.py b/rowers/dataprep.py
index 6f7bd55a..501154be 100644
--- a/rowers/dataprep.py
+++ b/rowers/dataprep.py
@@ -174,11 +174,11 @@ def workout_summary_to_df(
         weightvalues.append(w.weightvalue)
         notes.append(w.notes)
         tcx_link = SITE_URL+'/rowers/workout/{id}/emailtcx'.format(
-            id=w.id
+            id=encoder.encode_hex(w.id)
             )
         tcx_links.append(tcx_link)
         csv_link = SITE_URL+'/rowers/workout/{id}/emailcsv'.format(
-            id=w.id
+            id=encoder.encode_hex(w.id)
             )
         csv_links.append(csv_link)
         trimps.append(workout_trimp(w)[0])