diff --git a/src/gotenberg_client/_convert/libre_office.py b/src/gotenberg_client/_convert/libre_office.py
index b384fdf..066ed6b 100644
--- a/src/gotenberg_client/_convert/libre_office.py
+++ b/src/gotenberg_client/_convert/libre_office.py
@@ -59,7 +59,7 @@ def no_merge(self) -> Self:
         self._result_is_zip = True
         return self
 
-    def run(self) -> Union[SingleFileResponse, ZipFileResponse]:  # type: ignore[override], pragma: no cover
+    def run(self) -> Union[SingleFileResponse, ZipFileResponse]:  # type: ignore[override]
         resp = super().run()
 
         if self._result_is_zip:
diff --git a/src/gotenberg_client/_merge.py b/src/gotenberg_client/_merge.py
index 1288a2c..601c43f 100644
--- a/src/gotenberg_client/_merge.py
+++ b/src/gotenberg_client/_merge.py
@@ -8,6 +8,7 @@
 
 from gotenberg_client._base import BaseApi
 from gotenberg_client._base import BaseZipFileResponseRoute
+from gotenberg_client._types import Self
 
 
 class MergeRoute(BaseZipFileResponseRoute):
@@ -19,7 +20,7 @@ def __init__(self, client: Client, api_route: str) -> None:
         super().__init__(client, api_route)
         self._next = 1
 
-    def merge(self, files: List[Path]) -> "MergeRoute":
+    def merge(self, files: List[Path]) -> Self:
         """
         Adds the given files into the file mapping.  This method will maintain the
         ordering of the list.  Calling this method multiple times may not merge