diff --git a/collects/racket/file.rkt b/collects/racket/file.rkt
index 134343e381..2faa09b26e 100644
--- a/collects/racket/file.rkt
+++ b/collects/racket/file.rkt
@@ -107,7 +107,7 @@
          (define combined-str
            (cond
              [str-src (string-append str-src str-loc)]
-             [else (string-append "mztmp" str-loc)]))
+             [else (string-append "rkttmp" str-loc)]))
          (define sanitized-str 
            (regexp-replace*
             #rx"[<>]"
@@ -128,7 +128,7 @@
 
 (define make-temporary-file/proc
   (let ()
-    (define (make-temporary-file [template "mztmp~a"] [copy-from #f] [base-dir #f])
+    (define (make-temporary-file [template "rkttmp~a"] [copy-from #f] [base-dir #f])
       (with-handlers ([exn:fail:contract?
                        (lambda (x)
                          (raise-type-error 'make-temporary-file
diff --git a/collects/scribblings/reference/filesystem.scrbl b/collects/scribblings/reference/filesystem.scrbl
index 32f9b74dec..36377431c0 100644
--- a/collects/scribblings/reference/filesystem.scrbl
+++ b/collects/scribblings/reference/filesystem.scrbl
@@ -868,7 +868,7 @@ Creates directory specified by @racket[path], creating intermediate
 directories as necessary.}
 
 
-@defproc[(make-temporary-file [template string? "mztmp~a"]
+@defproc[(make-temporary-file [template string? "rkttmp~a"]
                               [copy-from-filename (or/c path-string? #f 'directory) #f]
                               [directory (or/c path-string? #f) #f])
          path?]{
@@ -887,11 +887,11 @@ provided and non-@racket[#f], in which case the
 file name generated from @racket[template] is combined with
 @racket[directory] to obtain a full path.
 
-The @racket[template] argument's default is only the string @racket["mztmp~a"]
+The @racket[template] argument's default is only the string @racket["rkttmp~a"]
 when there is no source location information for the callsite of
 @racket[make-temporary-file] (or if @racket[make-temporary-file] is
 used in a higher-order position). If there is such information, then the template
-string is built based on the source location.
+string is based on the source location.
 
 If @racket[copy-from-filename] is provided as path, the temporary file
 is created as a copy of the named file (using @racket[copy-file]). If