diff --git a/ruby.c b/ruby.c

index 541ef88..a47d7ce 100644

--- a/ruby.c

+++ b/ruby.c

@@ -111,6 +111,7 @@ cmdline_options_init(struct cmdline_options *opt)

     opt->src.enc.index = src_encoding_index;

     opt->ext.enc.index = -1;

     opt->intern.enc.index = -1;

+    opt->disable |= DISABLE_BIT(gems);

     return opt;

 }