diff --git a/src/Psalm/Type/Union.php b/src/Psalm/Type/Union.php
index c380abd7673..e24c641307e 100644
--- a/src/Psalm/Type/Union.php
+++ b/src/Psalm/Type/Union.php
@@ -428,6 +428,18 @@ public function freeze(): ImmutableUnion
             if ($key === 'exact_id') {
                 continue;
             }
+            if ($key === 'literal_string_types') {
+                continue;
+            }
+            if ($key === 'typed_class_strings') {
+                continue;
+            }
+            if ($key === 'literal_int_types') {
+                continue;
+            }
+            if ($key === 'literal_float_types') {
+                continue;
+            }
             $union->{$key} = $value;
         }
         return $union;