diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 3a4429c86f1f5a7a12b275ceef57ebdb5cc4e573..db7973eb3cebd30c172d786f42cf4706780dabe9 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -1491,9 +1491,9 @@ class ResourceAuditor
     return unless @online
     urls.each do |url|
       begin
-        nostdout { curl "--connect-timeout", "15", "-o", "/dev/null", "-r", "0-0", url }
+        nostdout { curl "--connect-timeout", "15", "--output", "/dev/null", "--range", "0-0", url }
       rescue ErrorDuringExecution
-        problem "The mirror #{u} is not reachable (curl exit code #{$?.exitstatus})"
+        problem "The mirror #{url} is not reachable (curl exit code #{$?.exitstatus})"
       end
       check_insecure_mirror(url) if url.start_with? "http:"
     end