diff --git a/modules/bitcoind.nix b/modules/bitcoind.nix
index af84cc8..d93bf81 100644
--- a/modules/bitcoind.nix
+++ b/modules/bitcoind.nix
@@ -7,7 +7,7 @@ let
   nbLib = config.nix-bitcoin.lib;
   secretsDir = config.nix-bitcoin.secretsDir;
 
-  configFile = pkgs.writeText "bitcoin.conf" ''
+  configFile = builtins.toFile "bitcoin.conf" ''
     # We're already logging via journald
     nodebuglogfile=1
 
diff --git a/modules/clightning.nix b/modules/clightning.nix
index d8838ec..8e52b04 100644
--- a/modules/clightning.nix
+++ b/modules/clightning.nix
@@ -11,7 +11,7 @@ let
     network=${network}
     bitcoin-datadir=${config.services.bitcoind.dataDir}
     ${optionalString (cfg.proxy != null) "proxy=${cfg.proxy}"}
-    always-use-proxy=${if cfg.always-use-proxy then "true" else "false"}
+    always-use-proxy=${boolToString cfg.always-use-proxy}
     bind-addr=${cfg.address}:${toString cfg.port}
     bitcoin-rpcconnect=${config.services.bitcoind.rpc.address}
     bitcoin-rpcport=${toString config.services.bitcoind.rpc.port}
diff --git a/test/run-tests.sh b/test/run-tests.sh
index 2593a3f..e59cc56 100755
--- a/test/run-tests.sh
+++ b/test/run-tests.sh
@@ -172,7 +172,7 @@ doBuild() {
 
 # Run the test by building the test derivation
 buildTest() {
-    vmTestNixExpr | doBuild $scenario $outLinkArg "$@" -
+    vmTestNixExpr | doBuild $scenario "$@" -
 }
 
 vmTestNixExpr() {