diff --git a/rwx/grub/__init__.py b/rwx/grub/__init__.py
index 7c0cccc..accec9f 100644
--- a/rwx/grub/__init__.py
+++ b/rwx/grub/__init__.py
@@ -25,8 +25,8 @@ def make_image(
     pubkey_path: str | None = None,
 ) -> None:
     """Make a binary bootable image."""
-    args: list[str | tuple[str, ...]] = [
-        "grub-mkimage",
+    args = [
+        ("grub-mkimage",),
         ("--compress", COMPRESSION),
         ("--format", image_format),
         ("--output", image_path),
@@ -35,6 +35,6 @@ def make_image(
     if pubkey_path:
         args.append(("--pubkey", pubkey_path))
     args.extend(modules)
-    if extra_modules := MODULES.get(image_format):
-        args.extend(extra_modules)
+    if modules := MODULES.get(image_format):
+        args.extend(modules)
     ps.run(*args)
diff --git a/rwx/ps/__init__.py b/rwx/ps/__init__.py
index 0bbab9c..e18e250 100644
--- a/rwx/ps/__init__.py
+++ b/rwx/ps/__init__.py
@@ -9,11 +9,10 @@ def get_tuples_args(*items: str | tuple[str, ...]) -> list[str]:
     """Turn arguments tuples into an arguments list."""
     args: list[str] = []
     for item in items:
-        match item:
-            case str():
-                args.append(item)
-            case tuple():
-                args.extend(item)
+        if type(item) is tuple:
+            args.extend(item)
+        else:
+            args.append(item)
     return args