diff --git a/tests/controls/windowtest.cpp b/tests/controls/windowtest.cpp
index f5f3e67056..58348da8ec 100644
--- a/tests/controls/windowtest.cpp
+++ b/tests/controls/windowtest.cpp
@@ -122,6 +122,7 @@ void WindowTestCase::KeyEvent()
     wxUIActionSimulator sim;
 
     m_window->SetFocus();
+    wxYield();
 
     sim.Text("text");
     sim.Char(WXK_SHIFT);