diff --git a/src/Composer/Console/Application.php b/src/Composer/Console/Application.php
index 74e270a96..cc39c587b 100644
--- a/src/Composer/Console/Application.php
+++ b/src/Composer/Console/Application.php
@@ -131,7 +131,8 @@ class Application extends BaseApplication
 
         if ($input->hasParameterOption('--no-cache')) {
             $io->writeError('Disabling cache usage', true, IOInterface::DEBUG);
-            putenv('COMPOSER_CACHE_DIR='.(Platform::isWindows() ? 'nul' : '/dev/null'));
+            $_SERVER['COMPOSER_CACHE_DIR'] = Platform::isWindows() ? 'nul' : '/dev/null';
+            putenv('COMPOSER_CACHE_DIR='.$_SERVER['COMPOSER_CACHE_DIR']);
         }
 
         // switch working dir
diff --git a/src/Composer/EventDispatcher/EventDispatcher.php b/src/Composer/EventDispatcher/EventDispatcher.php
index 45288825d..a5797fdae 100644
--- a/src/Composer/EventDispatcher/EventDispatcher.php
+++ b/src/Composer/EventDispatcher/EventDispatcher.php
@@ -242,7 +242,8 @@ class EventDispatcher
                     $finder = new PhpExecutableFinder();
                     $phpPath = $finder->find(false);
                     if ($phpPath) {
-                        putenv('PHP_BINARY=' . $phpPath);
+                        $_SERVER['PHP_BINARY'] = $phpPath;
+                        putenv('PHP_BINARY=' . $_SERVER['PHP_BINARY']);
                     }
                 }
 
diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index ff40b618f..2269d7958 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -200,8 +200,8 @@ class Installer
         }
 
         if ($this->runScripts) {
-            $devMode = (int) $this->devMode;
-            putenv("COMPOSER_DEV_MODE=$devMode");
+            $_SERVER['COMPOSER_DEV_MODE'] = (int) $this->devMode;
+            putenv('COMPOSER_DEV_MODE='.$_SERVER['COMPOSER_DEV_MODE']);
 
             // dispatch pre event
             $eventName = $this->update ? ScriptEvents::PRE_UPDATE_CMD : ScriptEvents::PRE_INSTALL_CMD;