diff --git a/bin/git-checkout-default-branch b/bin/git-checkout-default-branch
new file mode 100755
index 0000000..5011f73
--- /dev/null
+++ b/bin/git-checkout-default-branch
@@ -0,0 +1,12 @@
+#!/bin/sh
+#
+# Checkout default branch
+# This assumes that either `master` or `main` is the default
+
+if git show-ref --quiet refs/heads/master; then
+    git checkout master
+elif git show-ref --quiet refs/heads/main; then
+    git checkout main
+else
+    echo "Neither 'master' nor 'main' branch exists."
+fi
diff --git a/git/git-alii.zsh b/git/git-alii.zsh
index bd7e381..4dd1567 100644
--- a/git/git-alii.zsh
+++ b/git/git-alii.zsh
@@ -16,7 +16,7 @@ alias gcl="git clone"
 alias gcm="git commit -m"
 alias gco="git checkout"
 alias gcob="git checkout -b"
-alias gcom="git checkout master"
+alias gcom="git-checkout-default-branch"
 alias gcon="git checkout main"
 alias gcp="git cherry-pick"
 alias gcpa="git cherry-pick --abort"