diff --git a/rowers/interactiveplots.py b/rowers/interactiveplots.py
index 4ca7676b..dd2ce2e3 100644
--- a/rowers/interactiveplots.py
+++ b/rowers/interactiveplots.py
@@ -1346,6 +1346,7 @@ def instroke_interactive_chart(df,metric, workout, spm_min, spm_max,
     df_plot = df_plot.drop(["high 2", "low 2"])
     df_plot = df_plot.drop_nulls()
 
+    ytitle = "Y"
     if metric == 'boat accelerator curve':
         ytitle = "Boat acceleration (m/s^2)"
     elif metric == 'instroke boat speed':