diff --git a/science/mdynamix/Makefile b/science/mdynamix/Makefile
index aee6bb718628..70e120df0093 100644
--- a/science/mdynamix/Makefile
+++ b/science/mdynamix/Makefile
@@ -1,38 +1,36 @@
 PORTNAME=	mdynamix
 DISTVERSION=	5.2.8
 PORTREVISION=	4
 CATEGORIES=	science
 MASTER_SITES=	http://www.fos.su.se/~sasha/${PORTNAME}/versions/
 DISTNAME=	md${DISTVERSION:S/.//g}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	General purpose molecular dynamics code
 WWW=		http://www.fos.su.se/~sasha/mdynamix/
 
 LICENSE=	GPLv2+
 
-BROKEN_FreeBSD_12=	error: invalid value 'gnu++2b' in '-std=gnu++2b'
-
 LIB_DEPENDS=	libmpich.so:net/mpich
 
 USES=		fortran gmake
 
 ALL_TARGET=	default mpi
 MAKE_ARGS=	FFLAGS="${FFLAGS} -ffast-math" LDFLAGS="${LDFLAGS}"
 BINARY_ALIAS=	make=gmake gfortran=gfortran${GCC_DEFAULT}
 
 PLIST_FILES=	bin/md bin/mdp
 
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/md ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_PROGRAM} ${WRKSRC}/mdp ${STAGEDIR}${PREFIX}/bin
 
 .include <bsd.port.pre.mk>
 
 .if ${GCC_DEFAULT} >= 10
 # workaround for Type mismatch between actual argument at (1) and actual argument at (2) (INTEGER(4)/REAL(4)).
 # in theory, this should set FCFLAGS, but the port does not conform
 FFLAGS+=	-fallow-argument-mismatch
 .endif
 
 .include <bsd.port.post.mk>