diff --git a/synapse-module/default.nix b/synapse-module/default.nix
index df56f63..c4c3fde 100644
--- a/synapse-module/default.nix
+++ b/synapse-module/default.nix
@@ -427,7 +427,7 @@ in
         wantedBy = [ "matrix-synapse.target" ];
 
         preStart = let
-          flags = lib.cli.toGNUCommandLineShell {} {
+          flags = lib.cli.toCommandLineShellGNU {} {
             config-path = [ matrix-synapse-common-config ] ++ cfg.extraConfigFiles;
             keys-directory = cfg.dataDir;
             generate-keys = true;
@@ -443,7 +443,7 @@ in
           StateDirectory = "matrix-synapse";
           RuntimeDirectory = "matrix-synapse";
           ExecStart = let
-            flags = lib.cli.toGNUCommandLineShell {} {
+            flags = lib.cli.toCommandLineShellGNU {} {
               config-path = [ matrix-synapse-common-config ] ++ cfg.extraConfigFiles;
               keys-directory = cfg.dataDir;
             };
diff --git a/synapse-module/workers.nix b/synapse-module/workers.nix
index ed60628..b068011 100644
--- a/synapse-module/workers.nix
+++ b/synapse-module/workers.nix
@@ -389,7 +389,7 @@ in {
             done
           '';
           ExecStart = let
-            flags = lib.cli.toGNUCommandLineShell {} {
+            flags = lib.cli.toCommandLineShellGNU {} {
               config-path = [ matrix-synapse-common-config (workerConfig worker) ] ++ cfg.extraConfigFiles;
               keys-directory = cfg.dataDir;
             };