diff --git a/math/suitesparse-spex/Makefile b/math/suitesparse-spex/Makefile
index cec0b6975d60..62f3fc64c93b 100644
--- a/math/suitesparse-spex/Makefile
+++ b/math/suitesparse-spex/Makefile
@@ -1,31 +1,32 @@
 PORTNAME=	${MPORTNAME:tl}
-PORTVERSION=	2.3.0
+PORTVERSION=	2.3.1
 CATEGORIES=	math
 
 COMMENT=	Sparse Left-looking Integer-Preserving LU Factorization
 WWW=		https://faculty.cse.tamu.edu/davis/suitesparse.html
 
 LICENSE=	GPLv2+ LGPL3+
 LICENSE_COMB=	dual
 LICENSE_FILE=	${BUILD_WRKSRC}/LICENSE.txt
 
 LIB_DEPENDS=	libgmp.so:math/gmp	\
 		libmpfr.so:math/mpfr	\
 		libamd.so:math/suitesparse-amd	\
 		libcolamd.so:math/suitesparse-colamd
 
 USES=		localbase:ldflags
+LDFLAGS+=	-lm
 
 MPORTNAME=	SPEX
 USE_LDCONFIG=	yes
 
 .include "${.CURDIR}/../../math/suitesparse/bsd.suitesparse.mk"
 
 post-stage-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${BUILD_WRKSRC}/README.md	\
 		${STAGEDIR}${DOCSDIR}/${MPORTNAME}_README.md
 	${INSTALL_DATA} ${BUILD_WRKSRC}/Doc/${MPORTNAME}_UserGuide.pdf	\
 		${STAGEDIR}${DOCSDIR}
 
 .include <bsd.port.post.mk>