diff --git a/rowers/dataprepnodjango.py b/rowers/dataprepnodjango.py
index 379a0ddd..6b44f66f 100644
--- a/rowers/dataprepnodjango.py
+++ b/rowers/dataprepnodjango.py
@@ -359,12 +359,12 @@ def dataprep(rowdatadf,id=0,bands=True,barchart=True,otwpower=True,
 	except KeyError:
 	    equivergpower = 0*p+50.
 	
-	nowindpace = nowindpace.apply(lambda x: timedeltaconv(x))
+	nowindpace2 = nowindpace.apply(lambda x: timedeltaconv(x))
 	ergvelo = (equivergpower/2.8)**(1./3.)
 
 	ergpace = 500./ergvelo
 	ergpace[ergpace == np.inf] = 240.
-	ergpace = ergpace.apply(lambda x: timedeltaconv(x))
+	ergpace2 = ergpace.apply(lambda x: timedeltaconv(x))
 
 	data['ergpace'] = ergpace*1e3
 	data['nowindpace'] = nowindpace*1e3