diff --git a/comms/py-pyserial/Makefile b/comms/py-pyserial/Makefile
index b0dfcbe56ce8..7dd89f348134 100644
--- a/comms/py-pyserial/Makefile
+++ b/comms/py-pyserial/Makefile
@@ -1,24 +1,25 @@
 # Created by: Hye-Shik Chang <perky@fallin.lv>
 
 PORTNAME=	pyserial
 PORTVERSION=	3.5
+PORTREVISION=	1
 CATEGORIES=	comms python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	sbz@FreeBSD.org
 COMMENT=	Serial port encapsulation library for Python
 
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
 USES=		python:3.6+
 
-USE_PYTHON=	distutils autoplist
+USE_PYTHON=	distutils autoplist concurrent
 
 NO_ARCH=	yes
 
 do-test:
 	${SETENV} PYTHONPATH=${STAGEDIR}${PYTHONPREFIX_SITELIBDIR} ${PYTHON_CMD} ${WRKSRC}/test/test.py
 
 .include <bsd.port.mk>