diff --git a/tools/libinput-debug-gui.c b/tools/libinput-debug-gui.c
index e594ff98..3d7df1b2 100644
--- a/tools/libinput-debug-gui.c
+++ b/tools/libinput-debug-gui.c
@@ -809,6 +809,8 @@ window_init(struct window *w)
 	list_init(&w->evdev_devices);
 
 	w->win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+	if (getenv("LIBINPUT_RUNNING_TEST_SUITE"))
+		gtk_window_iconify(GTK_WINDOW(w->win));
 	gtk_widget_set_events(w->win, 0);
 	gtk_window_set_title(GTK_WINDOW(w->win), "libinput debugging tool");
 	gtk_window_set_default_size(GTK_WINDOW(w->win), 1024, 768);
diff --git a/tools/test_tool_option_parsing.py b/tools/test_tool_option_parsing.py
index d059d914..373aa8b9 100755
--- a/tools/test_tool_option_parsing.py
+++ b/tools/test_tool_option_parsing.py
@@ -354,6 +354,8 @@ def main():
 
     args += ['@MESON_BUILD_ROOT@']
 
+    os.environ['LIBINPUT_RUNNING_TEST_SUITE'] = '1'
+
     return subprocess.run([sys.executable] + args).returncode