diff --git a/src/chsrc.c b/src/chsrc.c
index a0c4ed8..f615d52 100644
--- a/src/chsrc.c
+++ b/src/chsrc.c
@@ -70,7 +70,7 @@ pl_ruby_setsrc (char *option)
       return;
     }
 
-  cmd = xy_2strjoin ("bundle config 'mirror.https://rubygems.org' ", source.url);
+  cmd = xy_2strjoin ("bundle config --global 'mirror.https://rubygems.org' ", source.url);
   chsrc_run (cmd);
 
   chsrc_say_thanks (&source);