diff --git a/src/Composer/Config.php b/src/Composer/Config.php
index a6bb51b99..819b7cd12 100644
--- a/src/Composer/Config.php
+++ b/src/Composer/Config.php
@@ -180,7 +180,7 @@ class Config
                     return $val;
                 }
 
-                return ($flags & self::RELATIVE_PATHS == 1) ? $val : $this->realpath($val);
+                return ($flags & self::RELATIVE_PATHS == self::RELATIVE_PATHS) ? $val : $this->realpath($val);
 
             case 'cache-ttl':
                 return (int) $this->config[$key];