diff --git a/configs/airootfs/root/.automated_script.sh b/configs/airootfs/root/.automated_script.sh
index e2dc0d4..6aa93a7 100644
--- a/configs/airootfs/root/.automated_script.sh
+++ b/configs/airootfs/root/.automated_script.sh
@@ -80,6 +80,12 @@ install_base_system() {
   # Ensure that no mounts exist from past install attempts
   findmnt -R /mnt >/dev/null && umount -R /mnt
 
+  # Workaround for archinstall 4.2 regression in sync_log_to_install_medium:
+  # `self.target / absolute_logfile` drops self.target because the RHS is
+  # absolute, so Python 3.14 Path.copy() raises EINVAL (source == target).
+  sed -i 's|logfile_target = self\.target / absolute_logfile$|logfile_target = self.target / absolute_logfile.relative_to("/")|' \
+    /usr/lib/python3.14/site-packages/archinstall/lib/installer.py
+
   # Install using files generated by the ./configurator
   # Skip NTP and WKD sync since we're offline (keyring is pre-populated in ISO)
   archinstall \