diff --git a/filters/commit-links.sh b/filters/commit-links.sh
index d2cd2b3..5881952 100755
--- a/filters/commit-links.sh
+++ b/filters/commit-links.sh
@@ -15,11 +15,14 @@
 # CGIT_REPO_CLONE_URL  ( = repo.clone-url setting )
 #
 
+regex=''
+
 # This expression generates links to commits referenced by their SHA1.
 regex=$regex'
-s|\b([0-9a-fA-F]{8,40})\b|<a href="./?id=\1">\1</a>|g'
+s|\b([0-9a-fA-F]{7,40})\b|<a href="./?id=\1">\1</a>|g'
+
 # This expression generates links to a fictional bugtracker.
 regex=$regex'
-s| #([0-9]+)\b|<a href="http://bugs.example.com/?bug=\1">#\1</a>|g'
+s|#([0-9]+)\b|<a href="http://bugs.example.com/?bug=\1">#\1</a>|g'
 
 sed -re "$regex"