diff --git a/src/Composer/Command/ConfigCommand.php b/src/Composer/Command/ConfigCommand.php
index c98fdda21..b6e1205d4 100644
--- a/src/Composer/Command/ConfigCommand.php
+++ b/src/Composer/Command/ConfigCommand.php
@@ -75,6 +75,7 @@ class ConfigCommand extends BaseCommand
                 new InputOption('absolute', null, InputOption::VALUE_NONE, 'Returns absolute paths when fetching *-dir config values instead of relative'),
                 new InputOption('json', 'j', InputOption::VALUE_NONE, 'JSON decode the setting value, to be used with extra.* keys'),
                 new InputOption('merge', 'm', InputOption::VALUE_NONE, 'Merge the setting value with the current value, to be used with extra.* keys in combination with --json'),
+                new InputOption('append', null, InputOption::VALUE_NONE, 'When adding a repository, append it (lowest priority) to the existing ones instead of prepending it (highest priority)'),
                 new InputArgument('setting-key', null, 'Setting key'),
                 new InputArgument('setting-value', InputArgument::IS_ARRAY, 'Setting value'),
             ))
@@ -596,7 +597,7 @@ EOT
                 $this->configSource->addRepository($matches[1], array(
                     'type' => $values[0],
                     'url' => $values[1],
-                ));
+                ), $input->getOption('append'));
 
                 return 0;
             }
@@ -605,13 +606,13 @@ EOT
                 $value = strtolower($values[0]);
                 if (true === $booleanValidator($value)) {
                     if (false === $booleanNormalizer($value)) {
-                        $this->configSource->addRepository($matches[1], false);
+                        $this->configSource->addRepository($matches[1], false, $input->getOption('append'));
 
                         return 0;
                     }
                 } else {
                     $value = JsonFile::parseJson($values[0]);
-                    $this->configSource->addRepository($matches[1], $value);
+                    $this->configSource->addRepository($matches[1], $value, $input->getOption('append'));
 
                     return 0;
                 }
diff --git a/src/Composer/Command/CreateProjectCommand.php b/src/Composer/Command/CreateProjectCommand.php
index 70569522d..497b71680 100644
--- a/src/Composer/Command/CreateProjectCommand.php
+++ b/src/Composer/Command/CreateProjectCommand.php
@@ -199,7 +199,7 @@ EOT
                 ) {
                     $configSource->addRepository('packagist.org', false);
                 } else {
-                    $configSource->addRepository($name, $repoConfig);
+                    $configSource->addRepository($name, $repoConfig, false);
                 }
 
                 $composer = Factory::create($io, null, $disablePlugins);
diff --git a/src/Composer/Config/ConfigSourceInterface.php b/src/Composer/Config/ConfigSourceInterface.php
index 0bd4faaa0..030123cc4 100644
--- a/src/Composer/Config/ConfigSourceInterface.php
+++ b/src/Composer/Config/ConfigSourceInterface.php
@@ -26,7 +26,7 @@ interface ConfigSourceInterface
      * @param string      $name   Name
      * @param array|false $config Configuration
      */
-    public function addRepository($name, $config);
+    public function addRepository($name, $config/* , $append = true */);
 
     /**
      * Remove a repository
diff --git a/src/Composer/Config/JsonConfigSource.php b/src/Composer/Config/JsonConfigSource.php
index e03e0f274..36b0bc972 100644
--- a/src/Composer/Config/JsonConfigSource.php
+++ b/src/Composer/Config/JsonConfigSource.php
@@ -57,9 +57,9 @@ class JsonConfigSource implements ConfigSourceInterface
     /**
      * {@inheritdoc}
      */
-    public function addRepository($name, $config)
+    public function addRepository($name, $config, $append = true)
     {
-        $this->manipulateJson('addRepository', $name, $config, function (&$config, $repo, $repoConfig) {
+        $this->manipulateJson('addRepository', $name, $config, $append, function (&$config, $repo, $repoConfig) use ($append) {
             // if converting from an array format to hashmap format, and there is a {"packagist.org":false} repo, we have
             // to convert it to "packagist.org": false key on the hashmap otherwise it fails schema validation
             if (isset($config['repositories'])) {
@@ -75,7 +75,11 @@ class JsonConfigSource implements ConfigSourceInterface
                 }
             }
 
-            $config['repositories'][$repo] = $repoConfig;
+            if ($append) {
+                $config['repositories'][$repo] = $repoConfig;
+            } else {
+                $config['repositories'] = array($repo => $repoConfig) + $config['repositories'];
+            }
         });
     }
 
diff --git a/src/Composer/Json/JsonManipulator.php b/src/Composer/Json/JsonManipulator.php
index ae9c95ce5..b2b1be872 100644
--- a/src/Composer/Json/JsonManipulator.php
+++ b/src/Composer/Json/JsonManipulator.php
@@ -145,9 +145,9 @@ class JsonManipulator
         });
     }
 
-    public function addRepository($name, $config)
+    public function addRepository($name, $config, $append = true)
     {
-        return $this->addSubNode('repositories', $name, $config);
+        return $this->addSubNode('repositories', $name, $config, $append);
     }
 
     public function removeRepository($name)
@@ -199,7 +199,7 @@ class JsonManipulator
         return $this->removeMainKey($name);
     }
 
-    public function addSubNode($mainNode, $name, $value)
+    public function addSubNode($mainNode, $name, $value, $append = true)
     {
         $decoded = JsonFile::parseJson($this->contents);
 
@@ -258,7 +258,7 @@ class JsonManipulator
                 return $matches['start'] . $that->format($value, 1) . $matches['end'];
             }, $children);
         } else {
-            $this->pregMatch('#^{ \s*? (?P<content>\S+.*?)? (?P<trailingspace>\s*) }$#sx', $children, $match);
+            $this->pregMatch('#^{ (?P<leadingspace>\s*?) (?P<content>\S+.*?)? (?P<trailingspace>\s*) }$#sx', $children, $match);
 
             $whitespace = '';
             if (!empty($match['trailingspace'])) {
@@ -271,11 +271,24 @@ class JsonManipulator
                 }
 
                 // child missing but non empty children
-                $children = preg_replace(
-                    '#'.$whitespace.'}$#',
-                    addcslashes(',' . $this->newline . $this->indent . $this->indent . JsonFile::encode($name).': '.$this->format($value, 1) . $whitespace . '}', '\\$'),
-                    $children
-                );
+                if ($append) {
+                    $children = preg_replace(
+                        '#'.$whitespace.'}$#',
+                        addcslashes(',' . $this->newline . $this->indent . $this->indent . JsonFile::encode($name).': '.$this->format($value, 1) . $whitespace . '}', '\\$'),
+                        $children
+                    );
+                } else {
+                    $whitespace = '';
+                    if (!empty($match['leadingspace'])) {
+                        $whitespace = $match['leadingspace'];
+                    }
+
+                    $children = preg_replace(
+                        '#^{'.$whitespace.'#',
+                        addcslashes('{' . $whitespace . JsonFile::encode($name).': '.$this->format($value, 1) . ',' . $this->newline . $this->indent . $this->indent, '\\$'),
+                        $children
+                    );
+                }
             } else {
                 if ($subName !== null) {
                     $value = array($subName => $value);
diff --git a/tests/Composer/Test/Json/JsonManipulatorTest.php b/tests/Composer/Test/Json/JsonManipulatorTest.php
index 9a0274740..118eb91c7 100644
--- a/tests/Composer/Test/Json/JsonManipulatorTest.php
+++ b/tests/Composer/Test/Json/JsonManipulatorTest.php
@@ -1935,7 +1935,7 @@ class JsonManipulatorTest extends TestCase
 ", $manipulator->getContents());
     }
 
-    public function testAddRepositoryCanAdd()
+    public function testAddRepositoryCanAppend()
     {
         $manipulator = new JsonManipulator('{
     "repositories": {
@@ -1946,7 +1946,7 @@ class JsonManipulatorTest extends TestCase
     }
 }');
 
-        $this->assertTrue($manipulator->addRepository('bar', array('type' => 'composer')));
+        $this->assertTrue($manipulator->addRepository('bar', array('type' => 'composer'), true));
         $this->assertEquals('{
     "repositories": {
         "foo": {
@@ -1961,6 +1961,32 @@ class JsonManipulatorTest extends TestCase
 ', $manipulator->getContents());
     }
 
+    public function testAddRepositoryCanPrepend()
+    {
+        $manipulator = new JsonManipulator('{
+    "repositories": {
+        "foo": {
+            "type": "vcs",
+            "url": "lala"
+        }
+    }
+}');
+
+        $this->assertTrue($manipulator->addRepository('bar', array('type' => 'composer'), false));
+        $this->assertEquals('{
+    "repositories": {
+        "bar": {
+            "type": "composer"
+        },
+        "foo": {
+            "type": "vcs",
+            "url": "lala"
+        }
+    }
+}
+', $manipulator->getContents());
+    }
+
     public function testAddRepositoryCanOverrideDeepRepos()
     {
         $manipulator = new JsonManipulator('{