diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index f0a6685..4add792 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -11,6 +11,7 @@
 "		2025 Apr 03 command substitution opening paren at EOL (#17026)
 "		2025 Apr 10 improve shell detection (#17084)
 "		2025 Apr 29 match escaped chars in test operands (#17221)
+"		2025 May 06 improve single-quote string matching in parameter expansions
 " Version:		208
 " Former URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
 " For options and settings, please use:      :help ft-sh-syntax
@@ -649,7 +650,7 @@
  syn match  shDerefOp	contained	"[,^]\{1,2}"	nextgroup=@shDerefPatternList
  syn match  shDerefOp	contained	"@[uULQEPAKa]"
 endif
-syn region shDerefString	contained	matchgroup=shDerefDelim start=+\%(\\\)\@<!'+ end=+'+	contains=shStringSpecial
+syn region shDerefString	contained	matchgroup=shDerefDelim start=+\%(\\\)\@<!'+ end=+'+
 syn region shDerefString	contained	matchgroup=shDerefDelim start=+\%(\\\)\@<!"+ skip=+\\"+ end=+"+	contains=@shDblQuoteList,shStringSpecial
 syn match  shDerefString	contained	"\\["']"	nextgroup=shDerefPattern
 
diff --git a/runtime/syntax/testdir/dumps/sh_quoting_00.dump b/runtime/syntax/testdir/dumps/sh_quoting_00.dump
new file mode 100644
index 0000000..a1beb8f
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/sh_quoting_00.dump
@@ -0,0 +1,20 @@
+>#+0#0000e05#ffffff0|!|/|b|i|n|/|d|a|s|h| +0#0000000&@63
+@75
+|e+0#af5f00255&|c|h|o| +0#e000002&|$+0#e000e06&|{|f|o@1|:+0#af5f00255&|-|'|s+0#e000002&|t|r|i|n|g| |\|'+0#af5f00255&|}+0#e000e06&| +0#0000000&@51
+@75
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|i+0#0000000&|s|_|d|a|s|h|:| |1|,| |i|s|_|p|o|s|i|x|:| |1|,| |i|s|_|s|h|:| |1|,| @22|1|,|1| @10|A|l@1| 
diff --git a/runtime/syntax/testdir/input/sh_quoting.sh b/runtime/syntax/testdir/input/sh_quoting.sh
new file mode 100644
index 0000000..dc6a515
--- /dev/null
+++ b/runtime/syntax/testdir/input/sh_quoting.sh
@@ -0,0 +1,4 @@
+#!/bin/dash
+
+echo ${foo:-'string \'}
+