diff --git a/src/Composer/Package/Loader/RootPackageLoader.php b/src/Composer/Package/Loader/RootPackageLoader.php
index aa6134735..5eceec97d 100644
--- a/src/Composer/Package/Loader/RootPackageLoader.php
+++ b/src/Composer/Package/Loader/RootPackageLoader.php
@@ -82,7 +82,7 @@ class RootPackageLoader extends ArrayLoader
             $commit = null;
 
             if (isset($config['extra']['branch-version'])) {
-                $config['version'] = preg_replace('{(\.x)?(-dev)?$}', '.x-dev', $config['extra']['branch-version']);
+                $config['version'] = preg_replace('{(\.x)?(-dev)?$}', '', $config['extra']['branch-version']).'.x-dev';
             } elseif (getenv('COMPOSER_ROOT_VERSION')) {
                 // override with env var if available
                 $config['version'] = getenv('COMPOSER_ROOT_VERSION');
diff --git a/src/Composer/Repository/PathRepository.php b/src/Composer/Repository/PathRepository.php
index f9aa4aea0..c3076e2e7 100644
--- a/src/Composer/Repository/PathRepository.php
+++ b/src/Composer/Repository/PathRepository.php
@@ -167,7 +167,7 @@ class PathRepository extends ArrayRepository implements ConfigurableRepositoryIn
 
             // use the branch-version as the package version if available
             if (!isset($package['version']) && isset($package['extra']['branch-version'])) {
-                $package['version'] = preg_replace('{(\.x)?(-dev)?$}', '.x-dev', $package['extra']['branch-version']);
+                $package['version'] = preg_replace('{(\.x)?(-dev)?$}', '', $package['extra']['branch-version']).'.x-dev';
             }
 
             // carry over the root package version if this path repo is in the same git repository as root package
diff --git a/tests/Composer/Test/Package/Loader/RootPackageLoaderTest.php b/tests/Composer/Test/Package/Loader/RootPackageLoaderTest.php
index f22954a9a..c50cc77e0 100644
--- a/tests/Composer/Test/Package/Loader/RootPackageLoaderTest.php
+++ b/tests/Composer/Test/Package/Loader/RootPackageLoaderTest.php
@@ -202,14 +202,27 @@ class RootPackageLoaderTest extends TestCase
         $this->assertEquals("dev-latest-production", $package->getPrettyVersion());
     }
 
-    public function testLoadExtraBranchVersion()
+    /**
+     * @dataProvider provideExtraBranchVersion
+     */
+    public function testLoadExtraBranchVersion($branchVersion)
     {
         $package = $this->loadPackage(array(
             'extra' => array(
-                'branch-version' => '1.2',
+                'branch-version' => $branchVersion,
             ),
         ));
 
         $this->assertEquals('1.2.x-dev', $package->getPrettyVersion());
     }
+
+    public function provideExtraBranchVersion()
+    {
+        return array(
+            array('1.2'),
+            array('1.2.x'),
+            array('1.2-dev'),
+            array('1.2.x-dev'),
+        );
+    }
 }