diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ca56818b..4cadb2b7f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,8 @@ BUG FIXES:
     checking a box checksum. [GH-2716]
   - hosts/bsd: Only run `nfsd checkexports` if there is an exports file.
     [GH-2714]
+  - commands/plugin: Fix exception that could happen rarely when installing
+    a plugin.
 
 ## 1.4.1 (December 18, 2013)
 
diff --git a/plugins/commands/plugin/action/install_gem.rb b/plugins/commands/plugin/action/install_gem.rb
index 72d0bc13a..07a5000fb 100644
--- a/plugins/commands/plugin/action/install_gem.rb
+++ b/plugins/commands/plugin/action/install_gem.rb
@@ -58,6 +58,9 @@ module VagrantPlugins
 
             installer = Gem::DependencyInstaller.new(:document => [], :prerelease => prerelease)
 
+            # If we don't have a version, use the default version
+            version ||= Gem::Requirement.default
+
             begin
               installer.install(plugin_name, version)
             rescue Gem::GemNotFoundException