diff --git a/modules/services/databases/postgresql.nix b/modules/services/databases/postgresql.nix
index caf9a586eb1..66bb722782a 100644
--- a/modules/services/databases/postgresql.nix
+++ b/modules/services/databases/postgresql.nix
@@ -203,6 +203,8 @@ in
                 sleep 1
             done
           '';
+
+        unitConfig.RequiresMountsFor = "${cfg.dataDir}";
       };
 
   };