diff --git a/ext/date/tests/bug65371.phpt b/ext/date/tests/bug65371.phpt
new file mode 100644
index 00000000000..cd025e06fcb
--- /dev/null
+++ b/ext/date/tests/bug65371.phpt
@@ -0,0 +1,22 @@
+--TEST--
+Testing bug #65371
+--INI--
+date.timezone=Europe/Berlin
+--FILE--
+<?php
+
+function p($str)
+{
+  echo $str, PHP_EOL;
+  echo strftime($str), PHP_EOL;
+  echo bin2hex($str), PHP_EOL;
+  echo bin2hex(strftime($str));
+}
+
+setlocale(LC_ALL, 'C');
+p('あ');
+--EXPECT--
+あ
+あ
+e38182
+e38182