diff --git a/builder/build-iso.sh b/builder/build-iso.sh
index 7d4a59a..b80517b 100755
--- a/builder/build-iso.sh
+++ b/builder/build-iso.sh
@@ -91,8 +91,8 @@ mkdir -p /var/cache/omarchy/mirror
 ln -s "$offline_mirror_dir" "/var/cache/omarchy/mirror/offline"
 
 # Copy the pacman.conf to the ISO's /etc directory so the live environment uses our
-# same config when booted
-cp $build_cache_dir/pacman.conf "$build_cache_dir/airootfs/etc/pacman.conf"
+# same config when booted. Use the online config with the correct mirror.
+cp $build_cache_dir/pacman-online-${OMARCHY_MIRROR}.conf "$build_cache_dir/airootfs/etc/pacman.conf"
 
 # Finally, we assemble the entire ISO
 mkarchiso -v -w "$build_cache_dir/work/" -o "/out/" "$build_cache_dir/"