diff --git a/CHANGELOG.md b/CHANGELOG.md
index 666d470..4a1d417 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,13 @@
 # 0.1.1 / _Not released yet_
 
+- Don't crash if there is no configuration for us in the Vagrantfiles ([GH-2])
+    * Related [Vagrant issue](https://github.com/mitchellh/vagrant/issues/1877)
 
 # 0.1.0 / 2013-06-27
 
 - Initial release
 - Support for Apt proxy configuration
 - Based heavily on [vagrant-cachier](https://github.com/fgrehm/vagrant-cachier) plugin
+
+
+[GH-2]:  https://github.com/tmatilai/vagrant-proxyconf/issues/2  "Issue 2"
diff --git a/lib/vagrant-proxyconf/action/configure_apt_proxy.rb b/lib/vagrant-proxyconf/action/configure_apt_proxy.rb
index 84a4020..dff4237 100644
--- a/lib/vagrant-proxyconf/action/configure_apt_proxy.rb
+++ b/lib/vagrant-proxyconf/action/configure_apt_proxy.rb
@@ -15,6 +15,12 @@ def call(env)
           @app.call env
 
           proxy_config = env[:machine].config.apt_proxy
+
+          # Vagrant does not seem to call `finalize!` if the configuration
+          # key is not used in Vagrantfiles.
+          # https://github.com/tmatilai/vagrant-proxyconf/issues/2
+          proxy_config.finalize!
+
           if !proxy_config.enabled?
             logger.debug "apt_proxy not enabled or configured"
           elsif !proxy_conf_capability?(env[:machine])