diff --git a/rowers/views/analysisviews.py b/rowers/views/analysisviews.py
index 63fc40a3..60dea044 100644
--- a/rowers/views/analysisviews.py
+++ b/rowers/views/analysisviews.py
@@ -317,7 +317,8 @@ def trendflexdata(workouts, options,userid=0):
     datadf['date'].replace(datemapping,inplace=True)
 
     today = datetime.date.today()
-    datadf['days ago'] = map(lambda x : x.days, datadf.date - today)
+    datadf['days ago'] = list(map(lambda x : x.days, datadf.date - today))
+
 
     if groupby != 'date':
         try: