diff --git a/bigquery/google/cloud/bigquery/_http.py b/bigquery/google/cloud/bigquery/_http.py
index 39ce770ba0de..0e5475f5f54b 100644
--- a/bigquery/google/cloud/bigquery/_http.py
+++ b/bigquery/google/cloud/bigquery/_http.py
@@ -59,7 +59,9 @@ def USER_AGENT(self, value):
 
     @property
     def _EXTRA_HEADERS(self):
-        self._extra_headers[_http.CLIENT_INFO_HEADER] = self._client_info.to_user_agent()
+        self._extra_headers[
+            _http.CLIENT_INFO_HEADER
+        ] = self._client_info.to_user_agent()
         return self._extra_headers
 
     @_EXTRA_HEADERS.setter
diff --git a/bigquery/tests/unit/test_client.py b/bigquery/tests/unit/test_client.py
index 426f14164345..08c36e0ac277 100644
--- a/bigquery/tests/unit/test_client.py
+++ b/bigquery/tests/unit/test_client.py
@@ -1339,7 +1339,7 @@ def test_get_table_sets_user_agent(self):
             _http=http,
         )
 
-        table = client.get_table(self.TABLE_REF)
+        client.get_table(self.TABLE_REF)
 
         expected_user_agent = user_agent_override.to_user_agent()
         http.request.assert_called_once_with(