diff --git a/tests/e2e/test_actor_api_helpers.py b/tests/e2e/test_actor_api_helpers.py
index 3747dd3b..2bda198d 100644
--- a/tests/e2e/test_actor_api_helpers.py
+++ b/tests/e2e/test_actor_api_helpers.py
@@ -425,6 +425,8 @@ def do_POST(self) -> None:
             await Actor.set_value('WEBHOOK_BODY', webhook_body)
 
     async def main_client() -> None:
+        import asyncio
+
         from apify import Webhook, WebhookEventType
 
         async with Actor:
@@ -438,6 +440,12 @@ async def main_client() -> None:
                 )
             )
 
+            # Keep the run alive for a moment after registering the webhook. Without this, the run finishes
+            # just milliseconds later and the platform may process the run-succeeded event before the freshly
+            # added ad-hoc webhook has propagated, in which case the webhook never fires and the server Actor
+            # waits until it times out.
+            await asyncio.sleep(5)
+
     server_actor, client_actor = await asyncio.gather(
         make_actor(label='add-webhook-server', main_func=main_server),
         make_actor(label='add-webhook-client', main_func=main_client),