diff --git a/modules/electrs.nix b/modules/electrs.nix
index 59f46b4..6d199ce 100644
--- a/modules/electrs.nix
+++ b/modules/electrs.nix
@@ -5,8 +5,6 @@ let
   cfg = config.services.electrs;
   inherit (config) nix-bitcoin-services;
   secretsDir = config.nix-bitcoin.secretsDir;
-  index-batch-size = "${if cfg.high-memory then "" else "--index-batch-size=10"}";
-  jsonrpc-import = "${if cfg.high-memory then "" else "--jsonrpc-import"}";
 in {
   imports = [
     (mkRenamedOptionModule [ "services" "electrs" "nginxport" ] [ "services" "electrs" "TLSProxy" "port" ])
@@ -73,7 +71,7 @@ in {
       preStart = ''
         mkdir -m 0770 -p ${cfg.dataDir}
         chown -R '${cfg.user}:${cfg.group}' ${cfg.dataDir}
-        echo "${pkgs.nix-bitcoin.electrs}/bin/electrs -vvv ${index-batch-size} ${jsonrpc-import} --timestamp --db-dir ${cfg.dataDir} --daemon-dir /var/lib/bitcoind --cookie=${config.services.bitcoind.rpcuser}:$(cat ${secretsDir}/bitcoin-rpcpassword) --electrum-rpc-addr=127.0.0.1:${toString cfg.port}" > /run/electrs/startscript.sh
+        echo "${pkgs.nix-bitcoin.electrs}/bin/electrs -vvv ${optionalString (!cfg.high-memory) "--jsonrpc-import --index-batch-size=10"} --timestamp --db-dir ${cfg.dataDir} --daemon-dir /var/lib/bitcoind --cookie=${config.services.bitcoind.rpcuser}:$(cat ${secretsDir}/bitcoin-rpcpassword) --electrum-rpc-addr=127.0.0.1:${toString cfg.port}" > /run/electrs/startscript.sh
       '';
       serviceConfig = rec {
         RuntimeDirectory = "electrs";