diff --git a/postgres/rootfs/etc/cont-init.d/99-run.sh b/postgres/rootfs/etc/cont-init.d/99-run.sh
index c9c367cdd..98c148a64 100755
--- a/postgres/rootfs/etc/cont-init.d/99-run.sh
+++ b/postgres/rootfs/etc/cont-init.d/99-run.sh
@@ -37,6 +37,7 @@ chmod -R 777 "$CONFIG_HOME"
 DB_PORT=5432
 DB_HOSTNAME=localhost
 DB_PASSWORD="$(bashio::config 'POSTGRES_PASSWORD')"
+DB_USERNAME=postgres
 if bashio::config.has_value "POSTGRES_USER"; then POSTGRES_USER="$(bashio::config "POSTGRES_USER")"; else POSTGRES_USER=postgres; fi
 
 export DB_PORT