diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index a3a57b5d..e6941926 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -581,6 +581,7 @@ def interactive_activitychart(workouts,startdate,enddate,stack='type',toolbar_lo
     p.plot_width=550
     p.plot_height=350
     p.toolbar_location = toolbar_location
+    p.y_range.start = 0
     p.sizing_mode = 'scale_width'
     url = "http://rowsandall.com/rowers/workout/@duration/"
     taptool = p.select(type=TapTool)