diff --git a/ext/mbstring/tests/gh10627.phpt b/ext/mbstring/tests/gh10627.phpt
index 901027a38212..2f4af8c559e1 100644
--- a/ext/mbstring/tests/gh10627.phpt
+++ b/ext/mbstring/tests/gh10627.phpt
@@ -2,27 +2,35 @@
 GH-10627 (mb_convert_encoding crashes PHP on Windows)
 --EXTENSIONS--
 mbstring
+--INI--
+mbstring.strict_detection=1
 --FILE--
 <?php
 
-$str = 'Sökinställningar';
+$str = "S\xF6kinst\xE4llningar";
 $data = [$str, 'abc'];
 var_dump(mb_convert_encoding($data, 'UTF-8', 'auto'));
 $data = [$str => 'abc', 'abc' => 'def'];
 var_dump(mb_convert_encoding($data, 'UTF-8', 'auto'));
+$data = ['abc' => $str, 'def' => 'abc'];
+var_dump(mb_convert_encoding($data, 'UTF-8', 'auto'));
 
 ?>
---EXPECT--
-array(2) {
-  [0]=>
-  string(16) "S?kinst?llningar"
+--EXPECTF--
+Warning: mb_convert_encoding(): Unable to detect character encoding in %s on line %d
+array(1) {
   [1]=>
   string(3) "abc"
 }
-array(2) {
-  ["S?kinst?llningar"]=>
-  string(3) "abc"
+
+Warning: mb_convert_encoding(): Unable to detect character encoding in %s on line %d
+array(1) {
   ["abc"]=>
   string(3) "def"
 }
 
+Warning: mb_convert_encoding(): Unable to detect character encoding in %s on line %d
+array(1) {
+  ["def"]=>
+  string(3) "abc"
+}