diff --git a/lld/MachO/Options.td b/lld/MachO/Options.td
--- a/lld/MachO/Options.td
+++ b/lld/MachO/Options.td
@@ -1182,7 +1182,7 @@
     HelpText<"This option is undocumented in ld64">,
     Flags<[HelpHidden]>,
     Group<grp_undocumented>;
-def bitcode_process_mode : Flag<["-"], "bitcode_process_mode">,
+def bitcode_process_mode : Separate<["-"], "bitcode_process_mode">,
     HelpText<"This option is undocumented in ld64">,
     Flags<[HelpHidden]>,
     Group<grp_undocumented>;