diff --git a/pytket/extensions/quantinuum/backends/api_wrappers.py b/pytket/extensions/quantinuum/backends/api_wrappers.py
index e7a00bfc..2b56e39d 100644
--- a/pytket/extensions/quantinuum/backends/api_wrappers.py
+++ b/pytket/extensions/quantinuum/backends/api_wrappers.py
@@ -79,29 +79,39 @@ class QuantinuumAPIProtocol(Protocol):
 
     def override_timeouts(
         self, timeout: Optional[int] = None, retry_timeout: Optional[int] = None
-    ) -> _OverrideManager: ...
+    ) -> _OverrideManager:
+        ...
 
-    def full_login(self) -> None: ...
+    def full_login(self) -> None:
+        ...
 
-    def login(self) -> str: ...
+    def login(self) -> str:
+        ...
 
-    def delete_authentication(self) -> None: ...
+    def delete_authentication(self) -> None:
+        ...
 
-    def submit_job(self, body: Dict) -> Response: ...
+    def submit_job(self, body: Dict) -> Response:
+        ...
 
     def retrieve_job_status(
         self, job_id: str, use_websocket: Optional[bool] = None
-    ) -> Optional[Dict]: ...
+    ) -> Optional[Dict]:
+        ...
 
     def retrieve_job(
         self, job_id: str, use_websocket: Optional[bool] = None
-    ) -> Optional[Dict]: ...
+    ) -> Optional[Dict]:
+        ...
 
-    def status(self, machine: str) -> str: ...
+    def status(self, machine: str) -> str:
+        ...
 
-    def cancel(self, job_id: str) -> dict: ...
+    def cancel(self, job_id: str) -> dict:
+        ...
 
-    def get_calendar(self, start_date: str, end_date: str) -> List[Dict[str, str]]: ...
+    def get_calendar(self, start_date: str, end_date: str) -> List[Dict[str, str]]:
+        ...
 
 
 class QuantinuumAPI(QuantinuumAPIProtocol):