diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index b76155a5a7cc..1b2a6772e3de 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -160,6 +160,8 @@ public function __construct(IOInterface $io, Config $config, RootPackageInterfac
      */
     public function run()
     {
+        gc_disable();
+
         if ($this->dryRun) {
             $this->verbose = true;
             $this->runScripts = false;