diff --git a/sysutils/mbgtools/Makefile b/sysutils/mbgtools/Makefile
index c8884cd1f80d..44044a6553c5 100644
--- a/sysutils/mbgtools/Makefile
+++ b/sysutils/mbgtools/Makefile
@@ -1,17 +1,18 @@
 PORTNAME=	mbgtools
 DISTVERSION=	fbsd-1.0.0
+PORTREVISION=	1
 CATEGORIES=	sysutils
 MASTER_SITES=	http://www.meinberg.de/download/drivers/
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Drivers and tools for Meinberg PTP/GPS cards
 WWW=		https://www.meinbergglobal.com/english/sw/
 
 LICENSE=	BSD2CLAUSE
 
 BROKEN_mips64=		fails to compile: unused variables
 
 USES=		kmod uidfix
 USE_RC_SUBR=	mbgsvcd
 
 .include <bsd.port.mk>
diff --git a/sysutils/mbgtools/files/patch-mbglib_common_macioctl.h b/sysutils/mbgtools/files/patch-mbglib_common_macioctl.h
new file mode 100644
index 000000000000..aaf89acfbd48
--- /dev/null
+++ b/sysutils/mbgtools/files/patch-mbglib_common_macioctl.h
@@ -0,0 +1,17 @@
+--- mbglib/common/macioctl.h.orig	2024-01-02 18:05:57 UTC
++++ mbglib/common/macioctl.h
+@@ -259,10 +259,12 @@ typedef struct
+     memcpy( _piob, _pin, _size )
+ 
+   #define _frc_iob_to_pout( _piob, _pout, _size ) \
+-    copyout( _piob, _pout, _size )
++    if (copyout( _piob, _pout, _size ) != 0) \
++      goto err_inval
+ 
+   #define _frc_iob_from_pin( _piob, _pin, _size ) \
+-    copyin( _pin, _piob, _size )
++    if (copyin( _pin, _piob, _size ) != 0) \
++      goto err_inval
+ 
+   #define _io_wait_pcps_sec_change( _pddev, _cmd, _type, _pout ) \
+     goto err_inval