diff --git a/collects/typed-scheme/optimizer/inexact-complex.rkt b/collects/typed-scheme/optimizer/inexact-complex.rkt
index 27443c5a..26420711 100644
--- a/collects/typed-scheme/optimizer/inexact-complex.rkt
+++ b/collects/typed-scheme/optimizer/inexact-complex.rkt
@@ -31,6 +31,7 @@
 ;; we keep the real and imaginary parts unboxed as long as we stay within
 ;; complex operations
 (define-syntax-class unboxed-inexact-complex-opt-expr
+  #:commit
 
   (pattern (#%plain-app (~and op (~literal +))
                         c1:unboxed-inexact-complex-opt-expr