diff --git a/t/t0450-txt-doc-vs-help.sh b/t/t0450-txt-doc-vs-help.sh
index 8fd20b6dba..cd3969e852 100755
--- a/t/t0450-txt-doc-vs-help.sh
+++ b/t/t0450-txt-doc-vs-help.sh
@@ -96,6 +96,21 @@ do
 		check_dashed_labels "$(help_to_synopsis "$builtin")"
 	'
 
+	test_expect_success "$builtin -h output has consistent spacing" '
+		h2s="$(help_to_synopsis "$builtin")" &&
+		sed -n \
+			-e "/^ / {
+				s/[^ ].*//;
+				p;
+			}" \
+			<"$h2s" >help &&
+		sort -u help >help.ws &&
+		if test -s help.ws
+		then
+			test_line_count = 1 help.ws
+		fi
+	'
+
 	txt="$(builtin_to_txt "$builtin")" &&
 	preq="$(echo BUILTIN_TXT_$builtin | tr '[:lower:]-' '[:upper:]_')" &&