diff --git a/modules/lamassu-lnbits.nix b/modules/lamassu-lnbits.nix
index aff78be..6993fbc 100644
--- a/modules/lamassu-lnbits.nix
+++ b/modules/lamassu-lnbits.nix
@@ -419,7 +419,9 @@ in
         # Explicitly rebuild problematic native modules that pnpm rebuild may miss
         # These modules often fail to build during pnpm rebuild due to missing toolchain in PATH
         echo "==> Rebuilding specific native modules..."
-        for module in node-expat iconv argon2; do
+
+        # node-expat and iconv use standard node-gyp
+        for module in node-expat iconv; do
           module_path=$(find node_modules/.pnpm -name "$module" -type d -path "*/$module" 2>/dev/null | head -1)
           if [ -n "$module_path" ] && [ -f "$module_path/binding.gyp" ]; then
             echo "    Rebuilding $module at $module_path..."
@@ -427,6 +429,13 @@ in
           fi
         done
 
+        # argon2 uses node-pre-gyp (different build system)
+        argon2_path=$(find node_modules/.pnpm -name "argon2" -type d -path "*/argon2" 2>/dev/null | head -1)
+        if [ -n "$argon2_path" ]; then
+          echo "    Rebuilding argon2 at $argon2_path..."
+          (cd "$argon2_path" && npx node-pre-gyp install --fallback-to-build 2>&1) || echo "    Warning: argon2 rebuild failed, continuing..."
+        fi
+
         echo "==> Building project..."
         # Use setsid to run turbo in a new session, isolating it from signal propagation
         # This prevents pnpm's signal handling issues (exit code -2) when turbo calls pnpm run build