diff --git a/devel/py-usbtmc/Makefile b/devel/py-usbtmc/Makefile
index b0bc8cc9a19c..6503417f365f 100644
--- a/devel/py-usbtmc/Makefile
+++ b/devel/py-usbtmc/Makefile
@@ -1,24 +1,25 @@
 PORTNAME=	usbtmc
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.8
+PORTREVISION=	1
 CATEGORIES=	devel python
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	joerg@FreeBSD.org
 COMMENT=	Pure Python USBTMC driver for controlling instruments over USB
 WWW=		https://github.com/python-ivi/python-usbtmc
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	${PY_SETUPTOOLS}
 RUN_DEPENDS=	${PYTHON_PKGNAMEPREFIX}pyusb>=0:devel/py-pyusb@${PY_FLAVOR}
 
 USES=		python
 USE_GITHUB=	yes
 USE_PYTHON=	autoplist distutils
 
 GH_ACCOUNT=	python-ivi
 GH_PROJECT=	python-usbtmc
 
 .include <bsd.port.mk>
diff --git a/devel/py-usbtmc/files/patch-usbtmc.py b/devel/py-usbtmc/files/patch-usbtmc.py
new file mode 100644
index 000000000000..afe7d72b87f2
--- /dev/null
+++ b/devel/py-usbtmc/files/patch-usbtmc.py
@@ -0,0 +1,11 @@
+--- usbtmc/usbtmc.py.orig	2017-01-18 05:35:14 UTC
++++ usbtmc/usbtmc.py
+@@ -841,7 +841,7 @@
+             raise NotImplementedError()
+ 
+     def _release_kernel_driver(self, interface_number):
+-        if os.name == 'posix':
++        if os.name == 'posix' and os.uname()[0] != 'FreeBSD':
+             if self.device.is_kernel_driver_active(interface_number):
+                 self.reattach.append(interface_number)
+                 try: