1 files changed, 1 insertions, 1 deletions
diff --git a/flake.nix b/flake.nix
index 8b7c0e6a5b..bb42c9ff9b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -178,7 +178,7 @@
                   EOF
                 '';
                 # Start synapse when `devenv up` is run.
-                processes.synapse.exec = "poetry run python -m synapse.app.homeserver -c homeserver.yaml --config-directory homeserver-config-overrides.d";
+                processes.synapse.exec = "poetry run python -m synapse.app.homeserver -c homeserver.yaml -c homeserver-config-overrides.d";
 
                 # Define the perl modules we require to run SyTest.
                 #