diff --git a/bin/git-rewrite-commits.sh b/bin/git-rewrite-commits.sh
index 217aa60..4ccf73c 100755
--- a/bin/git-rewrite-commits.sh
+++ b/bin/git-rewrite-commits.sh
@@ -8,23 +8,15 @@
 # Enforce being in a git repository
 git rev-parse --is-inside-work-tree >/dev/null || exit $?
 
-# We actually should check out the head branch via `git remote show ${REMOTE}`,
-# but this requires active connection and active 2FA verification. Tedious to
-# have multiple calls for this
-if git rev-parse --verify main &>/dev/null; then
-    MAIN_BRANCH=main
-else
-    MAIN_BRANCH=master
-fi
+HEAD_REMOT="$(git rev-parse --abbrev-ref origin/HEAD | cut -d/ -f2)"
+HEAD_LOCAL="$(git rev-parse --abbrev-ref        HEAD)"
 
-CURRENT_BRANCH="$(git rev-parse --abbrev-ref HEAD)"
-
-if [ "${CURRENT_BRANCH}" = "${MAIN_BRANCH}" ]; then
-    echo "Cannot rebase commits from '${CURRENT_BRANCH}' (HEAD) onto '${MAIN_BRANCH}'" >&2
+if [ "${HEAD_LOCAL}" = "${HEAD_REMOT}" ]; then
+    echo "Cannot rebase commits from '${HEAD_LOCAL}' (HEAD) onto '${HEAD_REMOT}'" >&2
     exit 1
 fi
 
-MERGE_BASE="$(git merge-base "${MAIN_BRANCH}" HEAD)"
+MERGE_BASE="$(git merge-base "${HEAD_REMOT}" HEAD)"
 
 # Show the next command
 set -x