diff --git a/racket/src/cs/compile-file.ss b/racket/src/cs/compile-file.ss
index c8d3bdd526..40f534ad1a 100644
--- a/racket/src/cs/compile-file.ss
+++ b/racket/src/cs/compile-file.ss
@@ -37,6 +37,7 @@
 (check-defined 'enable-type-recovery)
 (check-defined 'make-wrapper-procedure)
 (check-defined 'make-phantom-bytevector)
+(check-defined 'enable-arithmetic-left-associative)
 
 ;; ----------------------------------------
 
@@ -63,6 +64,7 @@
 (generate-inspector-information #f)
 (generate-procedure-source-information #f)
 (compile-compressed #f)
+(enable-arithmetic-left-associative #t)
 (define build-dir "")
 
 (define-values (src deps)
diff --git a/racket/src/cs/linklet.sls b/racket/src/cs/linklet.sls
index 27039a8d00..cda5881b67 100644
--- a/racket/src/cs/linklet.sls
+++ b/racket/src/cs/linklet.sls
@@ -1032,4 +1032,5 @@
 
   (set-foreign-eval! eval/foreign)
 
+  (enable-arithmetic-left-associative #t)
   (expand-omit-library-invocations #t))
diff --git a/racket/src/cs/rumble/vector.ss b/racket/src/cs/rumble/vector.ss
index d0269234e2..338b70ebb5 100644
--- a/racket/src/cs/rumble/vector.ss
+++ b/racket/src/cs/rumble/vector.ss
@@ -175,7 +175,7 @@
       (#3%vector-ref vec idx)
       (pariah (impersonate-vector-ref vec idx))))
 
-(define (vector*-ref vec idx)
+(define/who (vector*-ref vec idx)
   (#2%vector-ref vec idx))
 
 (define (impersonate-vector-ref orig idx)
@@ -183,7 +183,7 @@
            (#%vector? (impersonator-val orig)))
       (let loop ([o orig])
         (cond
-         [(#%vector? o) (#%vector-ref o idx)]
+         [(#%vector? o) (#2%vector-ref o idx)]
          [(vector-chaperone? o)
           (let* ([o-next (impersonator-next o)]
                  [val (loop o-next)]