diff --git a/tcl.yaml b/tcl.yaml
index 11113af77df0a596719f44d2b8ef1f5ffca65765..af2f65b90a2680c92a9a04ad698073850c2cae8a 100644
--- a/tcl.yaml
+++ b/tcl.yaml
@@ -1,4 +1,4 @@
 version_control: github
 src_repo: tcltk/tcl
 tag_prefix: ^core-
-seperator: -
+seperator: "-"