diff --git a/extra/game-input/game-input-tests.factor b/extra/game-input/game-input-tests.factor
index a5c79e0268..69b40dbec7 100644
--- a/extra/game-input/game-input-tests.factor
+++ b/extra/game-input/game-input-tests.factor
@@ -1,7 +1,8 @@
 IN: game-input.tests
-USING: game-input tools.test kernel system ;
+USING: game-input tools.test kernel system threads ;
 
 os windows? os macosx? or [
     [ ] [ open-game-input ] unit-test
+    [ ] [ yield ] unit-test
     [ ] [ close-game-input ] unit-test
 ] when
\ No newline at end of file