diff --git a/homeassistant/util/aiohttp.py b/homeassistant/util/aiohttp.py
index aa1aea1abc3..765a9994a67 100644
--- a/homeassistant/util/aiohttp.py
+++ b/homeassistant/util/aiohttp.py
@@ -44,13 +44,13 @@ class MockRequest:
         self.method = method
         self.url = url
         self.status = status
-        self.headers: CIMultiDict[str] = CIMultiDict(headers or {})
+        self.headers: CIMultiDict[str, str] = CIMultiDict(headers or {})
         self.query_string = query_string or ""
         self._content = content
         self.mock_source = mock_source
 
     @property
-    def query(self) -> MultiDict[str]:
+    def query(self) -> MultiDict[str, str]:
         """Return a dictionary with the query variables."""
         return MultiDict(parse_qsl(self.query_string, keep_blank_values=True))
 
@@ -68,7 +68,7 @@ class MockRequest:
         """Return the body as JSON."""
         return json.loads(self._text)
 
-    async def post(self) -> MultiDict[str]:
+    async def post(self) -> MultiDict[str, str]:
         """Return POST parameters."""
         return MultiDict(parse_qsl(self._text, keep_blank_values=True))