diff --git a/runtime/indent/yaml.vim b/runtime/indent/yaml.vim
index ed57e68..1f79841 100644
--- a/runtime/indent/yaml.vim
+++ b/runtime/indent/yaml.vim
@@ -2,7 +2,7 @@
 " Language:	YAML
 " Maintainer:	Nikolai Pavlov <zyx.vim@gmail.com>
 " Last Update:	Lukas Reineke
-" Last Change:	2021 Aug 13
+" Last Change:	2022 May 02
 
 " Only load this indent file when no other was loaded.
 if exists('b:did_indent')
@@ -54,7 +54,7 @@
 let s:c_ns_anchor_property =  '\v\&'.s:c_ns_anchor_name
 
 let s:ns_word_char = '\v[[:alnum:]_\-]'
-let s:ns_tag_char  = '\v%('.s:ns_word_char.'|[#/;?:@&=+$.~*''()])'
+let s:ns_tag_char  = '\v%(%\x\x|'.s:ns_word_char.'|[#/;?:@&=+$.~*''()])'
 let s:c_named_tag_handle     = '\v\!'.s:ns_word_char.'+\!'
 let s:c_secondary_tag_handle = '\v\!\!'
 let s:c_primary_tag_handle   = '\v\!'
@@ -63,7 +63,7 @@
             \            '|'.s:c_primary_tag_handle.')'
 let s:c_ns_shorthand_tag = '\v'.s:c_tag_handle . s:ns_tag_char.'+'
 let s:c_non_specific_tag = '\v\!'
-let s:ns_uri_char  = '\v%('.s:ns_word_char.'\v|[#/;?:@&=+$,.!~*''()[\]])'
+let s:ns_uri_char  = '\v%(%\x\x|'.s:ns_word_char.'\v|[#/;?:@&=+$,.!~*''()[\]])'
 let s:c_verbatim_tag = '\v\!\<'.s:ns_uri_char.'+\>'
 let s:c_ns_tag_property = '\v'.s:c_verbatim_tag.
             \               '\v|'.s:c_ns_shorthand_tag.