diff --git a/lib/hub/args.rb b/lib/hub/args.rb
index 2b58607d1a777b4369769059296e8830622ea8f8..c74681a8fd098957792b16e0b36a09d4f65e3942 100644
--- a/lib/hub/args.rb
+++ b/lib/hub/args.rb
@@ -29,7 +29,7 @@ module Hub
 
     # Boolean indicating whether an `after` callback has been set.
     def after?
-      defined?(@after)
+      !!defined?(@after)
     end
   end
 end