diff --git a/violinplot.m b/violinplot.m
index 4007b58..8b75c8c 100644
--- a/violinplot.m
+++ b/violinplot.m
@@ -90,7 +90,7 @@
         if isempty(grouporder)
             cats = categorical(cats);
         else
-            cats = categorical(cats,grouporder);
+            cats = categorical(cats, grouporder);
         end
 
         catnames = categories(cats);