diff --git a/src/Composer/Repository/ArtifactRepository.php b/src/Composer/Repository/ArtifactRepository.php
index 72ef46041..8442ce9ba 100644
--- a/src/Composer/Repository/ArtifactRepository.php
+++ b/src/Composer/Repository/ArtifactRepository.php
@@ -94,10 +94,6 @@ class ArtifactRepository extends ArrayRepository
             'shasum' => sha1_file($file->getRealPath())
         );
 
-        if(empty($package['version'])) {
-            $package['version'] = 'dev-master';
-        }
-
         $package = $this->loader->load($package);
 
         return $package;
diff --git a/tests/Composer/Test/Repository/ArtifactRepositoryTest.php b/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
index 1351f75e8..ac1bcbbe4 100644
--- a/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
+++ b/tests/Composer/Test/Repository/ArtifactRepositoryTest.php
@@ -24,8 +24,6 @@ class ArtifactRepositoryTest extends TestCase
         $expectedPackages = array(
             'vendor0/package0-0.0.1',
             'composer/composer-1.0.0-alpha6',
-            'composer/composer-dev-master',
-            'composer/composer-1.0.x-dev',
             'vendor1/package2-4.3.2',
         );
 
diff --git a/tests/Composer/Test/Repository/Fixtures/artifacts/artifact-no-version.zip b/tests/Composer/Test/Repository/Fixtures/artifacts/artifact-no-version.zip
deleted file mode 100644
index a60ba1fa9..000000000
Binary files a/tests/Composer/Test/Repository/Fixtures/artifacts/artifact-no-version.zip and /dev/null differ