diff --git a/modules/lamassu-lnbits.nix b/modules/lamassu-lnbits.nix
index a726069..311e927 100644
--- a/modules/lamassu-lnbits.nix
+++ b/modules/lamassu-lnbits.nix
@@ -319,6 +319,9 @@ in
         PYTHON = "${pkgs.python3}/bin/python3";
         # Ensure HOME is set for npm/pnpm cache
         HOME = cfg.dataDir;
+        # CRITICAL: pnpm fails without TTY unless CI=true is set
+        # See: https://github.com/pnpm/pnpm/issues/6434
+        CI = "true";
       };
 
       serviceConfig = {