diff --git a/comms/rxtx/Makefile b/comms/rxtx/Makefile
index 67854ea50e40..268886858230 100644
--- a/comms/rxtx/Makefile
+++ b/comms/rxtx/Makefile
@@ -1,29 +1,32 @@
 PORTNAME=	rxtx
 PORTVERSION=	2.2p2
 PORTREVISION=	4
 CATEGORIES=	comms java
 MASTER_SITES=	http://rxtx.qbang.org/pub/rxtx/
 PKGNAMESUFFIX=	-${JAVA_PORT:S/java\///}
 DISTNAME=	${PORTNAME}-${PORTVERSION:S/p/pre/}
 
 MAINTAINER=	james@elstone.net
 COMMENT=	Native interface to serial ports in Java
 WWW=		http://rxtx.qbang.org
 
 LICENSE=	LGPL21
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		gmake java libtool zip
+# jdk11: javah: not found
+# jdk17+: error: invalid use of a restricted identifier 'yield'
+JAVA_VERSION=	8
 
 JAVA_OS=	native
 GNU_CONFIGURE=	yes
 CONFIGURE_ENV=	JAVA_HOME=${JAVA_HOME}
 INSTALL_TARGET=	install-strip
 
 USE_LDCONFIG=	yes
 MAKE_JOBS_UNSAFE=	yes
 
 PLIST_SUB=	JAVA_HOME=${JAVA_HOME:S,^${PREFIX}/,,}
 PLIST_SUB+=	ARCH=${ARCH:C/armv.*/arm/:S/powerpc/ppc/}
 
 .include <bsd.port.mk>