diff --git a/src/calibre/srv/opts.py b/src/calibre/srv/opts.py
index 6713064ed0..c99e826e26 100644
--- a/src/calibre/srv/opts.py
+++ b/src/calibre/srv/opts.py
@@ -207,7 +207,7 @@ def opt_to_cli_help(opt):
 
 
 def bool_callback(option, opt_str, value, parser, *args, **kwargs):
-    setattr(parser.values, option.dest, opt_str.startswith('--enable'))
+    setattr(parser.values, option.dest, opt_str.startswith('--enable-'))
 
 
 def boolean_option(add_option, opt):