diff --git a/Zend/tests/multibyte/multibyte_encoding_007.phpt b/Zend/tests/multibyte/multibyte_encoding_007.phpt
new file mode 100644
index 00000000000..5e3323403d6
--- /dev/null
+++ b/Zend/tests/multibyte/multibyte_encoding_007.phpt
@@ -0,0 +1,15 @@
+--TEST--
+Don't segfault when zend.script_encoding=pass
+--EXTENSIONS--
+mbstring
+--INI--
+zend.multibyte=1
+zend.script_encoding=pass
+internal_encoding=UTF-8
+--FILE--
+<?php
+	print "Done!\n";
+?>
+--EXPECT--
+Warning: PHP Startup: INI setting contains invalid encoding "pass" in Unknown on line 0
+Done!
diff --git a/ext/mbstring/mbstring.c b/ext/mbstring/mbstring.c
index ad15dd6768e..9cbf539431e 100644
--- a/ext/mbstring/mbstring.c
+++ b/ext/mbstring/mbstring.c
@@ -474,7 +474,7 @@ static zend_result php_mb_zend_encoding_list_parser(const char *encoding_list, s
 	return php_mb_parse_encoding_list(
 		encoding_list, encoding_list_len,
 		(const mbfl_encoding ***)return_list, return_size,
-		persistent, /* arg_num */ 0, /* allow_pass_encoding */ 1);
+		persistent, /* arg_num */ 0, /* allow_pass_encoding */ 0);
 }
 
 static const zend_encoding *php_mb_zend_internal_encoding_getter(void)