diff --git a/security/py-kerberos/Makefile b/security/py-kerberos/Makefile
index 5d0c6fb20d05..73b97970dd4d 100644
--- a/security/py-kerberos/Makefile
+++ b/security/py-kerberos/Makefile
@@ -1,38 +1,38 @@
 PORTNAME=	kerberos
 PORTVERSION=	1.3.1
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	security python
 MASTER_SITES=	PYPI
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	dvl@FreeBSD.org
 COMMENT=	Kerberos bindings for python
 WWW=		https://github.com/apple/ccs-pykerberos
 
 LICENSE=	APACHE20
 
 OPTIONS_DEFAULT=	GSSAPI_BASE
 OPTIONS_SINGLE=		GSSAPI
 OPTIONS_SINGLE_GSSAPI=	GSSAPI_BASE GSSAPI_HEIMDAL GSSAPI_MIT
 
 GSSAPI_BASE_USES=		gssapi
 GSSAPI_HEIMDAL_USES=		gssapi:heimdal
 GSSAPI_MIT_USES=		gssapi:mit
 
 USES=		python
 USE_PYTHON=	distutils autoplist
 
 GSSAPI_BASE_EXTRA_PATCHES=	${PATCHDIR}/extra-patch-src_kerberosbasic.h \
 				${PATCHDIR}/extra-patch-src_kerberosgss.c \
 				${PATCHDIR}/extra-patch-src_kerberosgss.h \
 				${PATCHDIR}/extra-patch-src_kerberospw.h
 
 GSSAPI_HEIMDAL_EXTRA_PATCHES=	${GSSAPI_BASE_EXTRA_PATCHES}
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|getoutput("krb5-config|getoutput("${GSSAPIBASEDIR}/bin/krb5-config|g' ${WRKSRC}/setup.py
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PYTHONPREFIX_SITELIBDIR}/kerberos*.so
 
 .include <bsd.port.mk>
diff --git a/security/py-kerberos/files/patch-src_kerberos.c b/security/py-kerberos/files/patch-src_kerberos.c
new file mode 100644
index 000000000000..cd82fc5a3ccc
--- /dev/null
+++ b/security/py-kerberos/files/patch-src_kerberos.c
@@ -0,0 +1,23 @@
+--- src/kerberos.c.orig	2021-01-09 04:30:38 UTC
++++ src/kerberos.c
+@@ -14,6 +14,7 @@
+  * limitations under the License.
+  **/
+ 
++#define PY_SSIZE_T_CLEAN
+ #include <Python.h>
+ 
+ #include "kerberosbasic.h"
+@@ -244,9 +245,9 @@ static PyObject *channelBindings(PyObject *self, PyObj
+     char *initiator_address = NULL;
+     char *acceptor_address = NULL;
+     char *application_data = NULL;
+-    int initiator_length = 0;
+-    int acceptor_length = 0;
+-    int application_length = 0;
++    Py_ssize_t initiator_length = 0;
++    Py_ssize_t acceptor_length = 0;
++    Py_ssize_t application_length = 0;
+ 
+     PyObject *pychan_bindings = NULL;
+     struct gss_channel_bindings_struct *input_chan_bindings;