diff --git a/src/Composer/Repository/Vcs/GitBitbucketDriver.php b/src/Composer/Repository/Vcs/GitBitbucketDriver.php
index 694204899..dd4033991 100644
--- a/src/Composer/Repository/Vcs/GitBitbucketDriver.php
+++ b/src/Composer/Repository/Vcs/GitBitbucketDriver.php
@@ -61,7 +61,10 @@ class GitBitbucketDriver extends VcsDriver
      */
     public function initialize()
     {
-        Preg::match('#^https?://bitbucket\.org/([^/]+)/([^/]+?)(\.git|/?)?$#i', $this->url, $match);
+        if (!Preg::isMatch('#^https?://bitbucket\.org/([^/]+)/([^/]+?)(\.git|/?)?$#i', $this->url, $match)) {
+            throw new \InvalidArgumentException(sprintf('The Bitbucket repository URL %s is invalid. It must be the HTTPS URL of a Bitbucket repository.', $this->url));
+        }
+
         $this->owner = $match[1];
         $this->repository = $match[2];
         $this->originUrl = 'bitbucket.org';
diff --git a/src/Composer/Repository/Vcs/GitHubDriver.php b/src/Composer/Repository/Vcs/GitHubDriver.php
index e95492a66..33d7e8cd3 100644
--- a/src/Composer/Repository/Vcs/GitHubDriver.php
+++ b/src/Composer/Repository/Vcs/GitHubDriver.php
@@ -59,7 +59,10 @@ class GitHubDriver extends VcsDriver
      */
     public function initialize()
     {
-        Preg::match('#^(?:(?:https?|git)://([^/]+)/|git@([^:]+):/?)([^/]+)/(.+?)(?:\.git|/)?$#', $this->url, $match);
+        if (!Preg::isMatch('#^(?:(?:https?|git)://([^/]+)/|git@([^:]+):/?)([^/]+)/(.+?)(?:\.git|/)?$#', $this->url, $match)) {
+            throw new \InvalidArgumentException(sprintf('The GitHub repository URL %s is invalid.', $this->url));
+        }
+
         $this->owner = $match[3];
         $this->repository = $match[4];
         $this->originUrl = strtolower(!empty($match[1]) ? $match[1] : $match[2]);
diff --git a/src/Composer/Repository/Vcs/GitLabDriver.php b/src/Composer/Repository/Vcs/GitLabDriver.php
index 3c45b4e73..2e7d36cc2 100644
--- a/src/Composer/Repository/Vcs/GitLabDriver.php
+++ b/src/Composer/Repository/Vcs/GitLabDriver.php
@@ -94,7 +94,7 @@ class GitLabDriver extends VcsDriver
     public function initialize()
     {
         if (!Preg::isMatch(self::URL_REGEX, $this->url, $match)) {
-            throw new \InvalidArgumentException('The URL provided is invalid. It must be the HTTP URL of a GitLab project.');
+            throw new \InvalidArgumentException(sprintf('The GitLab repository URL %s is invalid. It must be the HTTP URL of a GitLab project.', $this->url));
         }
 
         $guessedDomain = !empty($match['domain']) ? $match['domain'] : $match['domain2'];
diff --git a/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
index e685b9dfd..b8fd2d2a5 100644
--- a/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitBitbucketDriverTest.php
@@ -218,6 +218,14 @@ class GitBitbucketDriverTest extends TestCase
         );
     }
 
+    public function testInitializeInvalidRepositoryUrl()
+    {
+        $this->setExpectedException('\InvalidArgumentException');
+
+        $driver = $this->getDriver(array('url' => 'https://bitbucket.org/acme'));
+        $driver->initialize();
+    }
+
     public function testSupports()
     {
         $this->assertTrue(
diff --git a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
index d48a8fd1c..fcffb583b 100644
--- a/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
+++ b/tests/Composer/Test/Repository/Vcs/GitHubDriverTest.php
@@ -14,11 +14,11 @@ namespace Composer\Test\Repository\Vcs;
 
 use Composer\Downloader\TransportException;
 use Composer\Repository\Vcs\GitHubDriver;
+use Composer\Test\Mock\ProcessExecutorMock;
 use Composer\Test\TestCase;
 use Composer\Util\Filesystem;
-use Composer\Util\Http\Response;
-use Composer\Test\Mock\ProcessExecutorMock;
 use Composer\Config;
+use Composer\Util\Http\Response;
 use Composer\Util\ProcessExecutor;
 
 class GitHubDriverTest extends TestCase
@@ -341,6 +341,50 @@ class GitHubDriverTest extends TestCase
         $process->assertComplete($this);
     }
 
+    /**
+     * @return void
+     */
+    public function initializeInvalidReoUrl()
+    {
+        $this->setExpectedException('\InvalidArgumentException');
+
+        $repoConfig = array(
+            'url' => 'https://github.com/acme',
+        );
+
+        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+        $httpDownloader = $this->getMockBuilder('Composer\Util\HttpDownloader')
+            ->setConstructorArgs(array($io, $this->config))
+            ->getMock();
+
+        $gitHubDriver = new GitHubDriver($repoConfig, $io, $this->config, $httpDownloader, new ProcessExecutorMock);
+        $gitHubDriver->initialize();
+    }
+
+    /**
+     * @dataProvider supportsProvider
+     * @param bool $expected
+     * @param string $repoUrl
+     */
+    public function testSupports($expected, $repoUrl)
+    {
+        $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
+
+        $this->assertSame($expected, GitHubDriver::supports($io, $this->config, $repoUrl));
+    }
+
+    /**
+     * @return list<array{bool, string}>
+     */
+    public function supportsProvider()
+    {
+        return array(
+            array(false, 'https://github.com/acme'),
+            array(true, 'https://github.com/acme/repository'),
+            array(true, 'git@github.com:acme/repository.git'),
+        );
+    }
+
     /**
      * @param string|object $object
      * @param string        $attribute