diff --git a/aider/commands.py b/aider/commands.py
index 3343d2808..217a8c30c 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -5,6 +5,7 @@ import sys
 import tempfile
 from collections import OrderedDict
 from pathlib import Path
+from typing import Generator
 
 import git
 import pyperclip
@@ -527,21 +528,23 @@ class Commands:
         try:
             if os.path.isabs(pattern):
                 # Handle absolute paths
-                raw_matched_files = [Path(pattern)]
+                raw_matched_files: list[Path] = [Path(pattern)]
             else:
-                raw_matched_files = list(Path(self.coder.root).glob(pattern))
+                raw_matched_files: list[Path] = list(
+                    Path(self.coder.root).glob(pattern)
+                )
         except ValueError as err:
             self.io.tool_error(f"Error matching {pattern}: {err}")
-            raw_matched_files = []
+            raw_matched_files: list[Path] = []
 
-        matched_files = []
+        matched_files: list[Path] = []
         for fn in raw_matched_files:
             matched_files += expand_subdir(fn)
 
         matched_files = [
-            str(Path(fn).relative_to(self.coder.root))
+            fn.relative_to(self.coder.root)
             for fn in matched_files
-            if Path(fn).is_relative_to(self.coder.root)
+            if fn.is_relative_to(self.coder.root)
         ]
 
         # if repo, filter against it
@@ -1076,8 +1079,7 @@ class Commands:
         self.io.tool_output(settings)
 
 
-def expand_subdir(file_path):
-    file_path = Path(file_path)
+def expand_subdir(file_path: Path) -> Generator[Path, None, None]:
     if file_path.is_file():
         yield file_path
         return
@@ -1085,7 +1087,7 @@ def expand_subdir(file_path):
     if file_path.is_dir():
         for file in file_path.rglob("*"):
             if file.is_file():
-                yield str(file)
+                yield file
 
 
 def parse_quoted_filenames(args):