diff --git a/profiles/default/linux/ppc64le/package.use.mask b/profiles/default/linux/ppc64le/package.use.mask
index 502d92cc4d12e..d033290a29494 100644
--- a/profiles/default/linux/ppc64le/package.use.mask
+++ b/profiles/default/linux/ppc64le/package.use.mask
@@ -1,6 +1,10 @@
-# Copyright 1999-2025 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # Mike Frysinger <vapier@gentoo.org> (2014-10-21)
 # This target supports ASAN/etc... #504200.
 sys-devel/gcc -sanitize
+
+# gtkmm with USE=vulkan depends on gtk[vulkan] which sets vulkan-loader[wayland]
+# which in turn depends on dev-libs/weston[headless], which is not keyworded
+dev-cpp/gtkmm vulkan
diff --git a/profiles/features/big-endian/package.use.mask b/profiles/features/big-endian/package.use.mask
index 483c166d8ca48..3fa30b5b4a78d 100644
--- a/profiles/features/big-endian/package.use.mask
+++ b/profiles/features/big-endian/package.use.mask
@@ -59,6 +59,8 @@ gnome-base/gnome-control-center wayland
 gnome-base/gnome-shell wayland
 gnome-extra/tecla wayland
 gui-libs/gtk wayland
+# gtkmm with USE=vulkan depends on gtk[vulkan] which sets vulkan-loader[wayland]
+dev-cpp/gtkmm vulkan
 gui-libs/vte wayland
 media-libs/clutter wayland
 media-libs/clutter-gtk wayland