diff --git a/bin/sh/tests/parser/Makefile b/bin/sh/tests/parser/Makefile
index 3c9e62c7a777..83df9852e630 100644
--- a/bin/sh/tests/parser/Makefile
+++ b/bin/sh/tests/parser/Makefile
@@ -36,6 +36,7 @@ FILES+=		dollar-quote8.0
 FILES+=		dollar-quote9.0
 FILES+=		dollar-quote10.0
 FILES+=		dollar-quote11.0
+FILES+=		dollar-quote12.0
 FILES+=		empty-braces1.0
 FILES+=		empty-cmd1.0
 FILES+=		for1.0
diff --git a/bin/sh/tests/parser/dollar-quote12.0 b/bin/sh/tests/parser/dollar-quote12.0
new file mode 100644
index 000000000000..838e27cda706
--- /dev/null
+++ b/bin/sh/tests/parser/dollar-quote12.0
@@ -0,0 +1,7 @@
+# $FreeBSD$
+
+# \u without any digits at all remains invalid.
+# Our choice is a parse error.
+
+v=$( (eval ": \$'\u'") 2>&1 >/dev/null)
+[ $? -ne 0 ] && [ -n "$v" ]