diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a798349..6ab54555 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,8 +30,10 @@ scheme are considered to be bugs.
 
 * [#435](https://github.com/intridea/hashie/pull/435): Mash `default_proc`s are now propagated down to nested sub-Hashes - [@michaelherold](https://github.com/michaelherold).
 * [#436](https://github.com/intridea/hashie/pull/436): Ensure that `Hashie::Extensions::IndifferentAccess` injects itself after a non-destructive merge - [@michaelherold](https://github.com/michaelherold).
+* [#438](https://github.com/intridea/hashie/pull/438): Fix: `NameError (uninitialized constant Hashie::Extensions::Parsers::YamlErbParser::Pathname)` in `Hashie::Mash.load` - [@onk](https://github.com/onk).
 * Your contribution here.
 
+
 ### Security
 
 * Your contribution here.
diff --git a/lib/hashie/extensions/parsers/yaml_erb_parser.rb b/lib/hashie/extensions/parsers/yaml_erb_parser.rb
index b3119393..e1beb6e7 100644
--- a/lib/hashie/extensions/parsers/yaml_erb_parser.rb
+++ b/lib/hashie/extensions/parsers/yaml_erb_parser.rb
@@ -1,5 +1,6 @@
 require 'yaml'
 require 'erb'
+require 'pathname'
 module Hashie
   module Extensions
     module Parsers