diff --git a/src/PhantomInstaller/Installer.php b/src/PhantomInstaller/Installer.php
index 495e4fb..003a82d 100644
--- a/src/PhantomInstaller/Installer.php
+++ b/src/PhantomInstaller/Installer.php
@@ -463,7 +463,7 @@ public static function getCdnUrl($version)
             $url = strtolower($url);
 
             // add version to URL when using "github.com/medium/phantomjs"
-            if(strpos('github.com/medium/phantomjs', $url) !== false) {
+            if(strpos($url, 'github.com/medium/phantomjs') !== false) {
                 return 'https://github.com/medium/phantomjs/releases/download/v'.$version.'/';
             }