diff --git a/src/Composer/ComposerProcessFactory.php b/src/Composer/ComposerProcessFactory.php
index b6249004..776b6b83 100644
--- a/src/Composer/ComposerProcessFactory.php
+++ b/src/Composer/ComposerProcessFactory.php
@@ -20,6 +20,7 @@
 use RuntimeException;
 use Symfony\Component\Process\ExecutableFinder;
 use Symfony\Component\Process\Process;
+use const PHP_OS_FAMILY;
 
 /**
  * @final
@@ -153,7 +154,12 @@ private static function getDefaultEnvVars(): array
     private static function retrieveComposerExecutable(): string
     {
         $executableFinder = new ExecutableFinder();
-        $executableFinder->addSuffix('.phar');
+
+        if (self::isWindows()) {
+            $executableFinder->setSuffixes(['.exe', '.bat', '.cmd', '.com']);
+        } else {
+            $executableFinder->addSuffix('.phar');
+        }
 
         if (null === $composer = $executableFinder->find('composer')) {
             throw new RuntimeException('Could not find a Composer executable.');
@@ -161,4 +167,9 @@ private static function retrieveComposerExecutable(): string
 
         return $composer;
     }
+
+    private static function isWindows(): bool
+    {
+        return PHP_OS_FAMILY !== 'Windows';
+    }
 }