diff --git a/gtk/meson.build b/gtk/meson.build
index 6044bced9d..badb3901bb 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -881,7 +881,7 @@ libgtk = shared_library('gtk-4',
   soversion: gtk_soversion,
   sources: [typefuncs, gtk_sources, gtkmarshal_h, gtkprivatetypebuiltins_h],
   c_args: gtk_cargs + common_cflags,
-  include_directories: [confinc, gdkinc, gtkinc],
+  include_directories: [confinc, gdkinc, gskinc, gtkinc],
   dependencies: gtk_deps + [libgdk_dep, libgsk_dep],
   link_with: [libgdk, libgsk, included_input_modules],
   link_args: common_ldflags,