diff --git a/modules/bitcoind.nix b/modules/bitcoind.nix
index 364a1e9..cb8244d 100644
--- a/modules/bitcoind.nix
+++ b/modules/bitcoind.nix
@@ -414,6 +414,8 @@ in {
       # Enable RPC access for group
       postStart = ''
         chmod g=r '${cfg.dataDir}/${optionalString cfg.regtest "regtest/"}.cookie'
+      '' + (optionalString cfg.regtest) ''
+        chmod g=x '${cfg.dataDir}/regtest'
       '';
 
       serviceConfig = nbLib.defaultHardening // {