diff --git a/modules/services/postgres.nix b/modules/services/postgres.nix
index 28e629b..dc2f08e 100644
--- a/modules/services/postgres.nix
+++ b/modules/services/postgres.nix
@@ -1,8 +1,8 @@
 { config, ... }:
 let
   dir = "/persist/postgresql/${config.services.postgresql.package.psqlSchema}";
-  uid = config.ids.uids.postgres;
-  gid = config.ids.gids.postgres;
+  uid = toString config.ids.uids.postgres;
+  gid = toString config.ids.gids.postgres;
 in {
   systemd.tmpfiles.rules = [ "d ${dir} 700 ${uid} ${gid}" ];
   services.postgresql = {
diff --git a/modules/services/synapse.nix b/modules/services/synapse.nix
index ecd2929..b2ab0d8 100644
--- a/modules/services/synapse.nix
+++ b/modules/services/synapse.nix
@@ -3,8 +3,8 @@ let
   dom = "lava.moe";
   sub = "matrix.lava.moe";
   dir = "/persist/matrix-synapse";
-  uid = config.ids.uids.matrix-synapse;
-  gid = config.ids.gids.matrix-synapse;
+  uid = toString config.ids.uids.matrix-synapse;
+  gid = toString config.ids.gids.matrix-synapse;
 in {
   networking.firewall.allowedTCPPorts = [ 80 443 ];
   systemd.tmpfiles.rules = [ "d ${dir} 700 ${uid} ${gid}" ];