diff --git a/security/pam_ocra/Makefile b/security/pam_ocra/Makefile
index 219da7af07dc..ebca30991ee4 100644
--- a/security/pam_ocra/Makefile
+++ b/security/pam_ocra/Makefile
@@ -1,25 +1,31 @@
 PORTNAME=	pam_ocra
 DISTVERSION=	1.6
 CATEGORIES=	security
 
 MAINTAINER=	sg2342@googlemail.com
 COMMENT=	RFC6287 (OCRA) PAM module
 WWW=		https://github.com/sg2342/pam_ocra
 
 LICENSE=	BSD2CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
 USES=		ssl uidfix
 USE_GITHUB=	yes
 GH_ACCOUNT=	sg2342
 
 CFLAGS+=	-I${OPENSSLINC}
 LDFLAGS+=	-L${OPENSSLLIB}
 
 PLIST_FILES=	lib/pam_ocra.so \
 		lib/pam_ocra.so.0 \
 		sbin/ocra_tool \
 		man/man8/pam_ocra.8.gz \
 		man/man8/ocra_tool.8.gz
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ${OSVERSION} >= 1400091
+CFLAGS+=	-Wno-error=cast-align
+.endif
+
 .include <bsd.port.mk>