diff --git a/railties/lib/rails/gem_dependency.rb b/railties/lib/rails/gem_dependency.rb
index 3a82202bd0..3cc75494e4 100644
--- a/railties/lib/rails/gem_dependency.rb
+++ b/railties/lib/rails/gem_dependency.rb
@@ -34,7 +34,7 @@ module Rails
       name    = directory_name_parts[0..-2].join('-')
       version = directory_name_parts.last
       result = self.new(name, :version => version)
-      spec_filename = File.join(unpacked_path, directory_name, '.specification')
+      spec_filename = File.join(directory_name, '.specification')
       if load_spec
         raise "Missing specification file in #{File.dirname(spec_filename)}. Perhaps you need to do a 'rake gems:refresh_specs'?" unless File.exists?(spec_filename)
         spec = YAML::load_file(spec_filename)
diff --git a/railties/test/gem_dependency_test.rb b/railties/test/gem_dependency_test.rb
index 195494a926..70f4496685 100644
--- a/railties/test/gem_dependency_test.rb
+++ b/railties/test/gem_dependency_test.rb
@@ -178,6 +178,13 @@ class GemDependencyTest < Test::Unit::TestCase
     assert_equal '= 1.1',     dummy_gem.version_requirements.to_s
   end
 
+  def test_gem_from_directory_name_loads_specification_successfully
+    assert_nothing_raised do
+      dummy_gem = Rails::GemDependency.from_directory_name(File.join(Rails::GemDependency.unpacked_path, 'dummy-gem-g-1.0.0'))
+      assert_not_nil dummy_gem.specification
+    end
+  end
+
   def test_gem_from_invalid_directory_name
     assert_raises RuntimeError do
       dummy_gem = Rails::GemDependency.from_directory_name('dummy-gem')