diff --git a/math/openfst/Makefile b/math/openfst/Makefile
index a6fc61b6d0bf..0c5b937e16a6 100644
--- a/math/openfst/Makefile
+++ b/math/openfst/Makefile
@@ -1,31 +1,33 @@
 # Created by: Dmitry Sivachenko <mitya@yandex-team.ru>
 
 PORTNAME=	openfst
 PORTVERSION=	1.8.1
 CATEGORIES=	math
 MASTER_SITES=	http://www.openfst.org/twiki/pub/FST/FstDownload/
 
 MAINTAINER=	kevlo@FreeBSD.org
 COMMENT=	Library for working with weighted finite-state transducers
 
 LICENSE=	APACHE20
 
 USES=		compiler:c++17-lang libtool python:3.6+
 USE_LDCONFIG=	yes
 GNU_CONFIGURE=	yes
 INSTALL_TARGET=	install-strip
 CONFIGURE_ARGS=	--enable-bin \
 		--enable-compact-fsts \
 		--enable-compress \
 		--enable-const-fsts \
 		--enable-far \
 		--enable-fsts \
 		--enable-linear-fsts \
 		--enable-lookahead-fsts \
 		--enable-mpdt \
 		--enable-ngram-fsts \
 		--enable-pdt \
 		--enable-python \
 		--enable-special
 
+CXXFLAGS_i386=	-msse -msse2 -mfpmath=sse
+
 .include <bsd.port.mk>