diff --git a/typed-racket-test/optimizer/missed-optimizations/pair.rkt b/typed-racket-test/optimizer/missed-optimizations/pair.rkt
index 3ec3833d..9398b2b3 100644
--- a/typed-racket-test/optimizer/missed-optimizations/pair.rkt
+++ b/typed-racket-test/optimizer/missed-optimizations/pair.rkt
@@ -45,8 +45,8 @@ END
 1
 1
 '()
-(mcons 2 (mcons 3))
-(mcons 3)
+(mcons 2 (mcons 3 '()))
+(mcons 3 '())
 '()
 2
 3