diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 67dcbbf7..6f428ba2 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -1937,7 +1937,7 @@ def performance_chart(user, startdate=None, enddate=None, kfitness=42, kfatigue=
 
     plot.line('date', 'fitness', source=source, color='blue',
               legend_label=fitlabel)
-    band = Band(base='date', upper='fitness', source=source, level='underlay',
+    band = Band(base='date', upper='fitness', lower=0, source=source, level='underlay',
                 fill_alpha=0.2, fill_color='blue')
     plot.add_layout(band)