diff --git a/services/postgres.nix b/services/postgres.nix
index fc9cd6e..02b1298 100644
--- a/services/postgres.nix
+++ b/services/postgres.nix
@@ -140,7 +140,7 @@ in
     command = "${script}/bin/run-postgres";
     shutdown.signal = 2;
     readiness_probe = {
-      exec.command = "${package}/bin/pg_isready";
+      exec.command = "${package}/bin/pg_isready -h $RUNTIME_PATH/${name} -p ${builtins.toString port} -U postgres";
       initial_delay_seconds = 2;
       period_seconds = 2;
       timeout_seconds = 2;