diff --git a/scoper.inc.php b/scoper.inc.php
index c6d60fbae..eed8a264b 100644
--- a/scoper.inc.php
+++ b/scoper.inc.php
@@ -28,8 +28,8 @@ return [
         function ($filePath, $prefix, $contents) {
             if ($filePath === 'src/Psalm/Config.php') {
                 return str_replace(
-                    $prefix . '\Composer\Autoload\ClassLoader',
-                    'Composer\Autoload\ClassLoader',
+                    [$prefix . '\Composer\Autoload\ClassLoader', '\'Psalm\\\\Issue\\\\\''],
+                    ['Composer\Autoload\ClassLoader', '\'' . $prefix . '\\\\Psalm\\\\Issue\\\\\''],
                     $contents
                 );
             }
diff --git a/src/Psalm/Config.php b/src/Psalm/Config.php
index 52aadcb05..1981f0300 100644
--- a/src/Psalm/Config.php
+++ b/src/Psalm/Config.php
@@ -1469,6 +1469,7 @@ class Config
             return $this->issue_handlers[$issue_type]->getReportingLevelForFile($file_path);
         }
 
+        // this string is replaced by scoper for Phars, so be careful
         $issue_class = 'Psalm\\Issue\\' . $issue_type;
 
         if (!class_exists($issue_class) || !is_a($issue_class, \Psalm\Issue\CodeIssue::class, true)) {