diff --git a/src/svgtinyps.php b/src/svgtinyps.php
index cea840d..95e318c 100644
--- a/src/svgtinyps.php
+++ b/src/svgtinyps.php
@@ -2,7 +2,7 @@
 
 use SVGTinyPS\SVGTinyPS;
 
-if (class_exists('\Composer\InstalledVersions')) {
+if ( ! class_exists('\Composer\InstalledVersions')) {
     require __DIR__.'/../vendor/autoload.php';
 }