diff --git a/gio/tests/meson.build b/gio/tests/meson.build
index 7ae3dacf9..22746c97e 100644
--- a/gio/tests/meson.build
+++ b/gio/tests/meson.build
@@ -67,7 +67,9 @@ gio_tests = {
   'fileattributematcher' : {},
   'filter-streams' : {},
   'giomodule' : {},
-  'gsubprocess' : {},
+  'gsubprocess' : {
+    'suite': host_system == 'windows' ? ['flaky'] : [],
+  },
   'g-file' : {},
   'g-file-info' : {
     'can_fail' : host_system == 'windows' and cc.get_id() != 'gcc',
diff --git a/glib/tests/meson.build b/glib/tests/meson.build
index 0c7182016..bbb68f984 100644
--- a/glib/tests/meson.build
+++ b/glib/tests/meson.build
@@ -114,6 +114,7 @@ glib_tests = {
   'sort' : {},
   'spawn-multithreaded' : {
     'can_fail': glib_build_static and host_system == 'windows',
+    'suite': host_system == 'windows' ? ['flaky'] : [],
   },
   'spawn-path-search' : {},
   'spawn-singlethread' : {