diff --git a/src/ert/scheduler/job.py b/src/ert/scheduler/job.py
index 174bff74f29..d7c75f169af 100644
--- a/src/ert/scheduler/job.py
+++ b/src/ert/scheduler/job.py
@@ -4,7 +4,7 @@
 import logging
 import uuid
 from enum import Enum
-from typing import TYPE_CHECKING, Callable, Optional, TypeVar
+from typing import TYPE_CHECKING, Callable, Optional
 
 from cloudevents.conversion import to_json
 from cloudevents.http import CloudEvent
@@ -20,7 +20,6 @@
     from ert.scheduler.scheduler import Scheduler
 
 logger = logging.getLogger(__name__)
-_T = TypeVar("_T")
 
 
 class State(str, Enum):
@@ -75,6 +74,7 @@ def driver(self) -> Driver:
 
     async def _submit_and_run_once(self, sem: asyncio.BoundedSemaphore) -> None:
         await sem.acquire()
+        cancel_task: Optional[asyncio.Task[None]] = None
 
         try:
             await self._send(State.SUBMITTING)
@@ -86,31 +86,11 @@ async def _submit_and_run_once(self, sem: asyncio.BoundedSemaphore) -> None:
             await self.started.wait()
 
             await self._send(State.RUNNING)
-
-            async def threadsafer_future_wait(future: asyncio.Future[_T]) -> _T:
-                while not future.done():
-                    await asyncio.sleep(0.01)
-                returncode = await future
-                return returncode
-
-            try:
-                returncode = await asyncio.wait_for(
-                    threadsafer_future_wait(self.returncode),
-                    timeout=self.real.max_runtime,
-                )
-            except asyncio.TimeoutError:
-                assert self.real.max_runtime is not None
-                await asyncio.sleep(self.real.max_runtime)
-                timeout_event = CloudEvent(
-                    {
-                        "type": EVTYPE_REALIZATION_TIMEOUT,
-                        "source": f"/ert/ensemble/{self._scheduler._ens_id}/real/{self.iens}",
-                        "id": str(uuid.uuid1()),
-                    }
-                )
-                assert self._scheduler._events is not None
-                await self._scheduler._events.put(to_json(timeout_event))
-                raise asyncio.CancelledError from None
+            if self.real.max_runtime is not None and self.real.max_runtime > 0:
+                cancel_task = asyncio.create_task(self._max_runtime_task())
+            while not self.returncode.done():
+                await asyncio.sleep(0.01)
+            returncode = await self.returncode
 
             if (
                 returncode == 0
@@ -129,6 +109,8 @@ async def threadsafer_future_wait(future: asyncio.Future[_T]) -> _T:
             await self.aborted.wait()
             await self._send(State.ABORTED)
         finally:
+            if cancel_task and not cancel_task.done():
+                cancel_task.cancel()
             sem.release()
 
     async def __call__(
@@ -151,6 +133,20 @@ async def __call__(
             )
             logger.error(message)
 
+    async def _max_runtime_task(self) -> None:
+        assert self.real.max_runtime is not None
+        await asyncio.sleep(self.real.max_runtime)
+        timeout_event = CloudEvent(
+            {
+                "type": EVTYPE_REALIZATION_TIMEOUT,
+                "source": f"/ert/ensemble/{self._scheduler._ens_id}/real/{self.iens}",
+                "id": str(uuid.uuid1()),
+            }
+        )
+        await self._scheduler._events.put(to_json(timeout_event))
+
+        self.returncode.cancel()  # Triggers CancelledError
+
     async def _send(self, state: State) -> None:
         status = STATE_TO_LEGACY[state]
         event = CloudEvent(