diff --git a/testing/rankwidth/APKBUILD b/testing/rankwidth/APKBUILD
index 045bd1eb4cd..7ab6d7d279d 100644
--- a/testing/rankwidth/APKBUILD
+++ b/testing/rankwidth/APKBUILD
@@ -2,22 +2,25 @@
 # Maintainer:
 pkgname=rankwidth
 pkgver=0.9
-pkgrel=3
+pkgrel=4
 pkgdesc="Library for calculating rank-width and rank-decompositions"
 url="https://sourceforge.net/projects/rankwidth/"
 arch="all"
 license="GPL-2.0-or-later"
 makedepends="libigraph-dev"
 options="!check" # no test suite
-source="https://master.dl.sourceforge.net/project/rankwidth/rw-$pkgver.tar.gz
-	igraph-0.10.1.patch"
+source="
+	https://master.dl.sourceforge.net/project/rankwidth/rw-$pkgver.tar.gz
+	igraph-0.10.1.patch
+	igraph-1.0.0.patch
+	"
 subpackages="$pkgname-static $pkgname-dev $pkgname-libs $pkgname-doc"
 builddir="$srcdir/rw-$pkgver"
 
 prepare() {
-       default_prepare
-       # config.sub is too old to recognize loongarch64-alpine-linux-musl
-       update_config_sub
+	default_prepare
+	# config.sub is too old to recognize loongarch64-alpine-linux-musl
+	update_config_sub
 }
 
 build() {
@@ -38,4 +41,5 @@ package() {
 sha512sums="
 f4f1910506cbdb557ca50bac6f63cfca3271a5df8d13c67d2d9bba79b9cdb03196a679e6091554175decbee0871888de71bed5746662c9a75418f0f5dd9bd609  rw-0.9.tar.gz
 94871294bf2ffc2733cf14c241773bb339d5aab1e6f5b2801c8406df367045fbcb3c5fb9787f0bbf6c4fefc1c40aca93736f1df4520e30c00f24294209c2811f  igraph-0.10.1.patch
+cbcb72ada8c498647ca783f5d5c47149c14b23eb90f580808b9e1f1e886e1d28f39f43068b4034b3c0e99813d87ca60d1a18683e68dd06e89816d05a76ed2770  igraph-1.0.0.patch
 "
diff --git a/testing/rankwidth/igraph-1.0.0.patch b/testing/rankwidth/igraph-1.0.0.patch
new file mode 100644
index 00000000000..e7acdb2103a
--- /dev/null
+++ b/testing/rankwidth/igraph-1.0.0.patch
@@ -0,0 +1,11 @@
+--- a/simplerw.c
++++ b/simplerw.c
+@@ -121,7 +121,7 @@
+ 	}
+ 
+ 	// Check for undirectedness
+-	if(igraph_is_directed(&igraph) || igraph_is_simple(&igraph, &isimple) || !isimple)
++	if(igraph_is_directed(&igraph) || igraph_is_simple(&igraph, &isimple, IGRAPH_DIRECTED) || !isimple)
+ 	{
+ 		printf("Input is not a simple, undirected graph from file %s.\n", filename);
+ 		igraph_destroy(&igraph);