diff --git a/PHPCI/Model/Build/GithubBuild.php b/PHPCI/Model/Build/GithubBuild.php
index d6b2b7b9..81510ae0 100644
--- a/PHPCI/Model/Build/GithubBuild.php
+++ b/PHPCI/Model/Build/GithubBuild.php
@@ -201,6 +201,8 @@ class GithubBuild extends RemoteGitBuild
      */
     protected function getDiffLineNumber(Builder $builder, $file, $line)
     {
+        $line = (integer)$line;
+
         $builder->logExecOutput(false);
 
         $prNumber = $this->getExtra('pull_request_number');