diff --git a/src/Psalm/Internal/Clause.php b/src/Psalm/Internal/Clause.php
index c4abe33d8..3ba55a0e6 100644
--- a/src/Psalm/Internal/Clause.php
+++ b/src/Psalm/Internal/Clause.php
@@ -106,7 +106,7 @@ class Clause
             $possibility_strings = [];
 
             foreach ($possibilities as $i => $_) {
-                krsort($possibilities[$i]);
+                ksort($possibilities[$i]);
                 $possibility_strings[$i] = array_keys($possibilities[$i]);
             }