diff --git a/nixos/modules/services/misc/matrix-synapse.nix b/nixos/modules/services/misc/matrix-synapse.nix
index 87999c3614fc..5e465926b832 100644
--- a/nixos/modules/services/misc/matrix-synapse.nix
+++ b/nixos/modules/services/misc/matrix-synapse.nix
@@ -30,7 +30,7 @@ ${optionalString (cfg.bind_host != null) ''
 bind_host: "${cfg.bind_host}"
 ''}
 server_name: "${cfg.server_name}"
-pid_file: "/var/run/matrix-synapse.pid"
+pid_file: "/run/matrix-synapse.pid"
 web_client: ${boolToString cfg.web_client}
 ${optionalString (cfg.public_baseurl != null) ''
 public_baseurl: "${cfg.public_baseurl}"