diff --git a/ext/mbstring/libmbfl/mbfl/mbfilter.c b/ext/mbstring/libmbfl/mbfl/mbfilter.c
index 50a0853665a..a2c117d2a30 100644
--- a/ext/mbstring/libmbfl/mbfl/mbfilter.c
+++ b/ext/mbstring/libmbfl/mbfl/mbfilter.c
@@ -462,10 +462,9 @@ enum mbfl_no_encoding mbfl_encoding_detector_judge(mbfl_encoding_detector *ident
 		while (n >= 0) {
 			filter = identd->filter_list[n];
 			if (!filter->flag) {
-				if (identd->strict && filter->status) {
-					continue;
+				if (!identd->strict || !filter->status) {
+					encoding = filter->encoding->no_encoding;
 				}
-				encoding = filter->encoding->no_encoding;
 			}
 			n--;
 		}
diff --git a/ext/mbstring/tests/bug45239.phpt b/ext/mbstring/tests/bug45239.phpt
new file mode 100644
index 00000000000..8d8ef4831ea
--- /dev/null
+++ b/ext/mbstring/tests/bug45239.phpt
@@ -0,0 +1,18 @@
+--TEST--
+Bug #45239 (encoding detector hangs with mbstring.strict_detection enabled)
+--INI--
+mbstring.strict_detection=1
+mbstring.http_input=UTF-8
+mbstring.internal_encoding=UTF-8
+--SKIPIF--
+<?php
+extension_loaded('mbstring') or die('skip');
+?>
+--FILE--
+<?php
+mb_internal_encoding("utf-8");
+mb_parse_str("a=%fc", $dummy);
+var_dump(mb_http_input());
+?>
+--EXPECT--
+string(5) "UTF-8"