diff --git a/modules/patroni/default.nix b/modules/patroni/default.nix
index 9ed1e10..7fd332f 100644
--- a/modules/patroni/default.nix
+++ b/modules/patroni/default.nix
@@ -271,6 +271,8 @@ in
           systemd-notify EXTEND_TIMEOUT_USEC=300000000
         '';
 
+        unitConfig.RequiresMountsFor = [ cfg.dataDir cfg.postgresqlDataDir ];
+
         serviceConfig = mkMerge [{
           User = cfg.user;
           Group = cfg.group;