diff --git a/app-text/cmark/cmark-0.31.0.ebuild b/app-text/cmark/cmark-0.31.0.ebuild
index da5a39b33e870..9d990ce41277c 100644
--- a/app-text/cmark/cmark-0.31.0.ebuild
+++ b/app-text/cmark/cmark-0.31.0.ebuild
@@ -19,6 +19,10 @@ RESTRICT="!test? ( test )"
 
 BDEPEND="test? ( ${PYTHON_DEPS} )"
 
+PATCHES=(
+	"${FILESDIR}/cmark-0.31.0_fix_api_test.patch"
+)
+
 pkg_setup() {
 	use test && python-any-r1_pkg_setup
 }
diff --git a/app-text/cmark/files/cmark-0.31.0_fix_api_test.patch b/app-text/cmark/files/cmark-0.31.0_fix_api_test.patch
new file mode 100644
index 0000000000000..defecc445c4e8
--- /dev/null
+++ b/app-text/cmark/files/cmark-0.31.0_fix_api_test.patch
@@ -0,0 +1,17 @@
+https://github.com/commonmark/cmark/commit/a739d4911b5fa5586679b8e55999719cc910d26b
+From: John MacFarlane <jgm@berkeley.edu>
+Date: Wed, 13 Mar 2024 14:31:28 -0700
+Subject: [PATCH] Flag root node as open...
+
+in `cmark_parser_new_with_mem_into_root`. Closes #532.
+--- a/src/blocks.c
++++ b/src/blocks.c
+@@ -98,6 +98,8 @@ cmark_parser *cmark_parser_new_with_mem_into_root(int options, cmark_mem *mem, c
+   cmark_strbuf_init(mem, &parser->linebuf, 0);
+   cmark_strbuf_init(mem, &parser->content, 0);
+ 
++  root->flags = CMARK_NODE__OPEN;
++
+   parser->refmap = cmark_reference_map_new(mem);
+   parser->root = root;
+   parser->current = root;