diff --git a/rowers/tasks.py b/rowers/tasks.py
index 388dc793..ff70925f 100644
--- a/rowers/tasks.py
+++ b/rowers/tasks.py
@@ -1032,7 +1032,7 @@ def handle_sendemail_breakthrough(workoutid, useremail,
     d = {
         'first_name':userfirstname,
         'siteurl':siteurl,
-        'workoutid':encoder.encode_hex(int(workoutid)),
+        'workoutid':encoder.encode_hex(workoutid),
         'btvalues':tablevalues,
         }
 
@@ -1468,7 +1468,7 @@ def handle_otwsetpower(self,f1, boattype, weightvalue,
         delta, cpvalues, ps[0], ps[1], ps[2], ps[3], ratio)
     if res:
         handle_sendemail_breakthrough(
-            workoutid, email,
+            encoder.decode_hex(workoutid), email,
             first_name,
             last_name, btvalues=btvalues.to_json())