diff --git a/test/threads/meson.build b/test/threads/meson.build
index 36cd7c40c..5680777bf 100644
--- a/test/threads/meson.build
+++ b/test/threads/meson.build
@@ -8,4 +8,6 @@ test('hb-shape-threads', executable('hb-shape-threads', 'hb-shape-threads.cc',
   install: false,
   ),
   workdir: meson.current_source_dir() / '..' / '..',
-  timeout: 100)
+  timeout: 100,
+  suite: ['threads', 'slow'],
+)