diff --git a/typed-racket-lib/typed-racket/optimizer/float-complex.rkt b/typed-racket-lib/typed-racket/optimizer/float-complex.rkt
index 36f20ecf..4f86c525 100644
--- a/typed-racket-lib/typed-racket/optimizer/float-complex.rkt
+++ b/typed-racket-lib/typed-racket/optimizer/float-complex.rkt
@@ -83,7 +83,7 @@
           (loop (mark-as-non-float new-o new-o)
                 (stx-cdr cs)))
         ;; we've hit floats, can start coercing
-        (n-ary->binary this-syntax unsafe (cons o cs)))))
+        (n-ary->binary this-syntax unsafe (cons #`(real->double-flonum #,o) cs)))))
 
 ;; a+bi / c+di, names for real and imag parts of result -> one let-values binding clause
 (define (unbox-one-complex-/ a b c d res-real res-imag)
diff --git a/typed-racket-test/optimizer/tests/float-complex-float.rkt b/typed-racket-test/optimizer/tests/float-complex-float.rkt
index 8f2d1efb..10bbbc4b 100644
--- a/typed-racket-test/optimizer/tests/float-complex-float.rkt
+++ b/typed-racket-test/optimizer/tests/float-complex-float.rkt
@@ -70,7 +70,7 @@ END
 -inf.0-1.0688403264087485i
 +nan.0+0.0i
 -0.8414709848078965-4.5353337789114595e-57i
-5.381428268223429e-17-0.9694319337396835i
+1524588609536.0-0.9694319337396835i
 2.2152990102767944+0.0i
 -5.84330415295662e+36-2.521848811753627e+37i
 -inf.0-0.0i