diff --git a/src/Psalm/Type/Reconciler.php b/src/Psalm/Type/Reconciler.php
index 9bf4d261d63..074ef233ab3 100644
--- a/src/Psalm/Type/Reconciler.php
+++ b/src/Psalm/Type/Reconciler.php
@@ -761,7 +761,7 @@ private static function getValueForKey(
                                 return null;
                             }
 
-                            $new_base_type_candidate = $existing_key_type_part->getGenericValueType();
+                            $new_base_type_candidate = $existing_key_type_part->getGenericValueType(true);
                         } else {
                             $array_properties = $existing_key_type_part->properties;