diff --git a/scripts/wd-functions.sh b/scripts/wd-functions.sh
index 3111d40..d645a42 100644
--- a/scripts/wd-functions.sh
+++ b/scripts/wd-functions.sh
@@ -34,7 +34,7 @@ get_branch_name()
     if $using_git; then
         # FIXME: guess a branch name when a non-branch revision is checked
         # out
-        local res=$(sed -ne 's|^ref: refs/heads/||p' "$scripts_dir"/../.git/HEAD 2>/dev/null)
+        local res=$(sed -ne 's|^ref: refs/heads/||p' "$(git rev-parse --git-dir)"/HEAD 2>/dev/null)
         echo "$res"
     fi
 }