diff --git a/src/Composer/Compiler.php b/src/Composer/Compiler.php
index c11617e43..9217da4a6 100644
--- a/src/Composer/Compiler.php
+++ b/src/Composer/Compiler.php
@@ -49,6 +49,13 @@ public function compile(string $pharFile = 'composer.phar'): void
             unlink($pharFile);
         }
 
+        if (getenv('COMPOSER_VERSION') && getenv('COMPOSER_DATE')) {
+            $this->version = getenv('COMPOSER_VERSION');
+            $this->versionDate = new \DateTime(getenv('COMPOSER_DATE'));
+            $this->versionDate->setTimezone(new \DateTimeZone('UTC'));
+            goto skip_git;
+        }
+
         $process = new ProcessExecutor();
 
         $command = Git::buildRevListCommand($process, ['-n1', '--format=%H', 'HEAD']);
@@ -77,6 +84,7 @@ public function compile(string $pharFile = 'composer.phar'): void
             }
         }
 
+        skip_git:
         if ('' === $this->version) {
             throw new \UnexpectedValueException('Version detection failed');
         }