diff --git a/math/rankwidth/Makefile b/math/rankwidth/Makefile
index 9d7893bba895..ddc56597979a 100644
--- a/math/rankwidth/Makefile
+++ b/math/rankwidth/Makefile
@@ -1,25 +1,26 @@
 PORTNAME=	rankwidth	# Also known as: rw
 PORTVERSION=	0.9
+PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	SF/${PORTNAME}/
 DISTNAME=	rw-${PORTVERSION}
 
 MAINTAINER=	thierry@FreeBSD.org
 COMMENT=	Calculation of rank-width and rank-decompositions
 WWW=		https://sourceforge.net/projects/rankwidth/
 
 LICENSE=	GPLv2
 
 LIB_DEPENDS=	libigraph.so:math/igraph
 
 USES=		autoreconf libtool localbase pkgconfig
 
 CONFLICTS_INSTALL=	rw
 
 OPTIONS_DEFINE=	DOCS
 
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
 DOCSDIR=	${PREFIX}/share/doc/rw
 
 .include <bsd.port.mk>
diff --git a/math/rankwidth/files/patch-simplerw.c b/math/rankwidth/files/patch-simplerw.c
new file mode 100644
index 000000000000..378f8e7c47a3
--- /dev/null
+++ b/math/rankwidth/files/patch-simplerw.c
@@ -0,0 +1,11 @@
+--- simplerw.c.orig	2023-02-26 14:01:13 UTC
++++ simplerw.c
+@@ -134,7 +134,7 @@ int read_graph(const char *format, const char * filena
+ 		igraph_destroy(&igraph);
+ 		return(-1);
+ 	}
+-	igraph_get_adjacency(&igraph, &imatrix, IGRAPH_GET_ADJACENCY_BOTH, 0);
++	igraph_get_adjacency(&igraph, &imatrix, IGRAPH_GET_ADJACENCY_BOTH, NULL, IGRAPH_LOOPS_ONCE);
+ 	igraph_destroy(&igraph);
+ 	if(igraph_matrix_nrow(&imatrix) > MAX_VERTICES)
+ 	{