diff --git a/R/plotMortalityTableComparisons.R b/R/plotMortalityTableComparisons.R
index 66680007e6dfbc493d3aae9c7a21608d0eb54241..cb6ca2a84b8c937d67e249f176a87fa9f271ef45 100644
--- a/R/plotMortalityTableComparisons.R
+++ b/R/plotMortalityTableComparisons.R
@@ -56,7 +56,7 @@ plotMortalityTableComparisons = function(
                           env=list(refname=reference@name));
     }
 
-    pl = ggplot(data, aes(x = x, y = y, colour = data$group)) +
+    pl = ggplot(data, aes(x = x, y = y, color = group)) +
         theme_bw() +
         theme(
             plot.title = element_text(size=18, face="bold"),