diff --git a/docker/datanode/entrypoint.sh b/docker/datanode/entrypoint.sh
index 4d7b934..7627e91 100755
--- a/docker/datanode/entrypoint.sh
+++ b/docker/datanode/entrypoint.sh
@@ -55,8 +55,8 @@ export GRAYLOG_DATANODE_NODE_ID_FILE="${GRAYLOG_DATANODE_NODE_ID_FILE:-$GDN_DATA
 export GRAYLOG_DATANODE_OPENSEARCH_CONFIG_LOCATION="${GRAYLOG_DATANODE_OPENSEARCH_CONFIG_LOCATION:-"$GRAYLOG_DATANODE_DATA_DIR/opensearch/config"}"
 export GRAYLOG_DATANODE_OPENSEARCH_DATA_LOCATION="${GRAYLOG_DATANODE_OPENSEARCH_DATA_LOCATION:-"$GRAYLOG_DATANODE_DATA_DIR/opensearch/data"}"
 export GRAYLOG_DATANODE_OPENSEARCH_LOGS_LOCATION="${GRAYLOG_DATANODE_OPENSEARCH_LOGS_LOCATION:-"$GRAYLOG_DATANODE_DATA_DIR/opensearch/logs"}"
-export GRAYLOG_DATANODE_OPENSEARCH_HTTP_PORT="9200"
-export GRAYLOG_DATANODE_OPENSEARCH_TRANSPORT_PORT="9300"
+export GRAYLOG_DATANODE_OPENSEARCH_HTTP_PORT="${GRAYLOG_DATANODE_OPENSEARCH_HTTP_PORT:-9200}"
+export GRAYLOG_DATANODE_OPENSEARCH_TRANSPORT_PORT="${GRAYLOG_DATANODE_OPENSEARCH_TRANSPORT_PORT:-9300}"
 export GRAYLOG_DATANODE_NODE_NAME="${GRAYLOG_DATANODE_NODE_NAME:-"$HOSTNAME"}"
 
 # TODO: Bundle the OpenSearch version property in the tarball so we can read it