diff --git a/collects/net/sendurl.ss b/collects/net/sendurl.ss
index 0c9d0be2cd..2687610371 100644
--- a/collects/net/sendurl.ss
+++ b/collects/net/sendurl.ss
@@ -56,8 +56,7 @@
     (cond
       [(procedure? external) (external url-str)]
       [(eq? stype 'macosx)
-       (browser-process
-        (format "open \"~a\"'" url-str))]
+       (browser-process (format "open \"~a\"" url-str))]
       [(eq? stype 'windows)
        (shell-execute #f url-str "" (current-directory) 'SW_SHOWNORMAL)]
       [(not (eq? stype 'unix))