diff --git a/api/advent22_api/dav_common.py b/api/advent22_api/dav_common.py
index 264182a..6f6e3c2 100644
--- a/api/advent22_api/dav_common.py
+++ b/api/advent22_api/dav_common.py
@@ -17,7 +17,7 @@ _WEBDAV_CLIENT = WebDAVclient(
 
 
 @AsyncTTL(time_to_live=SETTINGS.cache_ttl)
-async def dav_list_files(regex: re.Pattern, directory: str = "") -> list[str]:
+async def dav_list_files(regex: re.Pattern[str], directory: str = "") -> list[str]:
     ls = _WEBDAV_CLIENT.list(directory)
     return [f"{directory}/{path}" for path in ls if regex.search(path)]
 
diff --git a/api/advent22_api/routers/_misc.py b/api/advent22_api/routers/_misc.py
index ec44dd2..899bf88 100644
--- a/api/advent22_api/routers/_misc.py
+++ b/api/advent22_api/routers/_misc.py
@@ -51,17 +51,15 @@ async def get_letter(
     return (await shuffle(cfg.puzzle.solution))[index]
 
 
-_RE_IMAGE_FILE = re.compile(
-    r"\.(gif|jpe?g|tiff?|png|bmp)$",
-    flags=re.IGNORECASE,
-)
-
-
 async def list_images_auto() -> list[str]:
     """
     Finde alle Bilder im "automatisch"-Verzeichnis
     """
-    ls = await dav_list_files(_RE_IMAGE_FILE, "/images_auto")
+
+    ls = await dav_list_files(
+        re.compile(r"\.(gif|jpe?g|tiff?|png|bmp)$", flags=re.IGNORECASE),
+        "/images_auto",
+    )
     ls = await set_length(ls, 24)
 
     return await shuffle(ls)