diff --git a/lib/squib/constants.rb b/lib/squib/constants.rb
index 30a8514..b636150 100644
--- a/lib/squib/constants.rb
+++ b/lib/squib/constants.rb
@@ -149,7 +149,7 @@ module Squib
       :dy => :dx, # delta
       :gap => :gap,
       :height => :height,
-      :inner_radius => :inner_radius
+      :inner_radius => :inner_radius,
       :margin => :margin,
       :outer_radius => :outer_radius,
       :paper_width => :width,