diff --git a/racket/src/cs/c/cross-serve.ss b/racket/src/cs/c/cross-serve.ss
index 147c214b03..9eaa8850d5 100644
--- a/racket/src/cs/c/cross-serve.ss
+++ b/racket/src/cs/c/cross-serve.ss
@@ -42,7 +42,7 @@
                                                               3
                                                               (optimize-level))]
                                           [fasl-compressed compress-code?])
-                             (compile-to-port (list v) o #f #f #f (string->symbol target) #f pred))))]
+                             (compile-to-port (list v) o #f #f #f (string->symbol target) #f pred 'omit-rtds))))]
                        [(#\f)
                         ;; Reads host fasl format, then writes target fasl format
                         (call-with-fasled
diff --git a/racket/src/cs/linklet.sls b/racket/src/cs/linklet.sls
index 57cd97160a..87fd89edb1 100644
--- a/racket/src/cs/linklet.sls
+++ b/racket/src/cs/linklet.sls
@@ -258,6 +258,8 @@
                                (call-getting-literals
                                 quoteds
                                 (lambda (pred)
+                                  ;; If arguments change here, then probably they should change in
+                                  ;; "cross-serve.ss", too:
                                   (compile-to-port s o #f #f #f (machine-type) #f pred 'omit-rtds)))))))
   (define (expand/optimize* e unsafe?)
     (call-with-system-wind (lambda ()