diff --git a/tcllib.yaml b/tcllib.yaml
index f0225a3..a576066 100644
--- a/tcllib.yaml
+++ b/tcllib.yaml
@@ -1,4 +1,4 @@
 version_control: github
 src_repo: tcltk/tcllib
-tag_prefix: tcllib-
-seperator: -
+tag_prefix: tcllib_
+seperator: _