diff --git a/rktboot/make-boot.rkt b/rktboot/make-boot.rkt
index 299d46ac8a..f7d36dde9d 100644
--- a/rktboot/make-boot.rkt
+++ b/rktboot/make-boot.rkt
@@ -43,7 +43,7 @@
                                          (build-path scheme-dir "s")))])
     (status (format "Use ~a" dir))
     (for/fold ([d d]) ([f (in-list (directory-list dir))]
-                       #:when (regexp-match? #rx"[.](?:rkt|ss|sls)$" f))
+                       #:when (regexp-match? #rx"[.](?:rkt|ss|sls|def)$" f))
       (max d (file-or-directory-modify-seconds (build-path dir f))))))
 
 (status (format "Check ~a" out-subdir))
@@ -348,7 +348,7 @@
   (status "Load most front.ss declarations")
   (call-with-expressions
    (build-path scheme-dir "s/front.ss")
-   (lambda (e)
+   (lambda (e)<
      ;; Skip `package-stubs`, which would undo "syntax.ss" definitions
      (let loop ([e e])
        (match e
diff --git a/s/nt.def b/s/nt.def
index 4bdfcab1d0..34887c2d1a 100644
--- a/s/nt.def
+++ b/s/nt.def
@@ -10,4 +10,7 @@
                                   "unsigned long long int"
                                   "unsigned long"))
 
+(define-constant typedef-i64 "long long")
+(define-constant typedef-u64 "unsigned long long")
+
 (define-constant long-bits 32)