diff --git a/net-libs/ixwebsocket/files/ixwebsocket-11.4.4-fix-gcc15.patch b/net-libs/ixwebsocket/files/ixwebsocket-11.4.4-fix-gcc15.patch
new file mode 100644
index 0000000000..4b504e1aa6
--- /dev/null
+++ b/net-libs/ixwebsocket/files/ixwebsocket-11.4.4-fix-gcc15.patch
@@ -0,0 +1,12 @@
+https://bugs.gentoo.org/937500
+https://github.com/machinezone/IXWebSocket/pull/538
+Fix build with GCC 15.
+--- a/third_party/msgpack11/msgpack11.hpp
++++ b/third_party/msgpack11/msgpack11.hpp
+@@ -1,5 +1,6 @@
+ #pragma once
+ 
++#include <cstdint>
+ #include <string>
+ #include <vector>
+ #include <map>
diff --git a/net-libs/ixwebsocket/ixwebsocket-11.4.4.ebuild b/net-libs/ixwebsocket/ixwebsocket-11.4.4.ebuild
index d0675734a4..e1f3d8e05d 100644
--- a/net-libs/ixwebsocket/ixwebsocket-11.4.4.ebuild
+++ b/net-libs/ixwebsocket/ixwebsocket-11.4.4.ebuild
@@ -1,4 +1,4 @@
-# Copyright 2021-2023 Gentoo Authors
+# Copyright 2021-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -49,6 +49,8 @@ PATCHES=(
 	"${FILESDIR}/${P}-use-system-spdlog.patch"
 	# Fix Server empty thread name
 	"${FILESDIR}/${P}-fix-server-empty-thread-name.patch"
+	# Fix build with GCC 15
+	"${FILESDIR}/${P}-fix-gcc15.patch"
 )
 
 src_configure() {