diff --git a/src/Psalm/Internal/Codebase/Scanner.php b/src/Psalm/Internal/Codebase/Scanner.php
index b4a4fe2ea..18a4ece26 100644
--- a/src/Psalm/Internal/Codebase/Scanner.php
+++ b/src/Psalm/Internal/Codebase/Scanner.php
@@ -764,7 +764,7 @@ class Scanner
         $new_fq_class_name_lc = strtolower($new_fq_class_name);
 
         if ($new_fq_class_name_lc !== $fq_class_name_lc) {
-            $classlikes->addClassAlias($new_fq_class_name_lc, $fq_class_name_lc);
+            $classlikes->addClassAlias($new_fq_class_name, $fq_class_name_lc);
             $fq_class_name_lc = $new_fq_class_name_lc;
         }