diff --git a/dlls/user/tests/win.c b/dlls/user/tests/win.c
index 42c6ed5a31f..7ad9aea7d8e 100644
--- a/dlls/user/tests/win.c
+++ b/dlls/user/tests/win.c
@@ -2524,6 +2524,7 @@ static void test_mouse_input(HWND hwnd)
     ShowWindow(popup, SW_SHOW);
 
     while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE)) DispatchMessageA(&msg);
+    flush_events();
 
     mouse_event(MOUSEEVENTF_LEFTDOWN, 0, 0, 0, 0);
     mouse_event(MOUSEEVENTF_LEFTUP, 0, 0, 0, 0);