diff --git a/etc/rc.subr b/etc/rc.subr
index 97412f9713f1..066d99b4f6ff 100644
--- a/etc/rc.subr
+++ b/etc/rc.subr
@@ -1,19 +1,24 @@
-#	$NetBSD: rc.subr,v 1.3 1998/01/26 04:36:26 lukem Exp $
+#	$NetBSD: rc.subr,v 1.4 1998/02/28 22:54:02 lukem Exp $
 # functions used by various rc scripts
 
 # Test $1 variable, and warn if not set to YES or NO.
 checkyesno() {
-	eval value=\$${1};
+	eval value=\$${1}
 	case $value in
-	[Yy][Ee][Ss])
-		return 0;
+
+		#	"yes", "true", "on", or "1"
+	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
+		return 0
 		;;
-	[Nn][Oo])
-		return 1;
+
+		#	"no", "false", "off", or "0"
+	[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
+		return 1
 		;;
+
 	*)
 		logger -s "WARNING: \$${1} is not set properly."
-		return 1;
+		return 1
 		;;
 	esac
 }