diff --git a/scripts/installer.sh b/scripts/installer.sh
index c7520eb..62c7ed6 100755
--- a/scripts/installer.sh
+++ b/scripts/installer.sh
@@ -3,7 +3,9 @@ set -eu
 repo=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
 cd "$repo"
 region=${1:-euw}
-case "$region" in euw|eune|na|br|kr|jp|lan|las|oce|ru|tr) ;; *) echo 'Use a Riot installer region code' >&2; exit 1;; esac
+# Riot publishes LAN, LAS and OCE installers under their platform codes.
+case "$region" in lan) region=la1;; las) region=la2;; oce) region=oc1;; esac
+case "$region" in euw|eune|na|br|kr|jp|la1|la2|oc1|ru|tr) ;; *) echo 'Use a Riot installer region code' >&2; exit 1;; esac
 python3 scripts/configure.py >/dev/null
 bash build/runtime/tools/fetch-installer.sh "$region" build/installer
 unzip -q -o "build/installer/live.$region.zip" -d build/installer