diff --git a/lib/octocatalog-diff/catalog-diff/filter/compilation_dir.rb b/lib/octocatalog-diff/catalog-diff/filter/compilation_dir.rb
index 5e2747dd..b105f8ad 100644
--- a/lib/octocatalog-diff/catalog-diff/filter/compilation_dir.rb
+++ b/lib/octocatalog-diff/catalog-diff/filter/compilation_dir.rb
@@ -66,12 +66,12 @@ def remove_compilation_dir(v, dir)
           value
         end
 
-        def traverse(a)
+        def traverse(a, &proc)
           case a
           when Array
-            a.map { |v| traverse(v, &Proc.new) }
+            a.map { |v| traverse(v, &proc) }
           when Hash
-            traverse(a.values, &Proc.new)
+            traverse(a.values, &proc)
           else
             yield a
           end