diff --git a/src/control_backend/agents/user_interrupt/user_interrupt_agent.py b/src/control_backend/agents/user_interrupt/user_interrupt_agent.py
index 05af28a..108e821 100644
--- a/src/control_backend/agents/user_interrupt/user_interrupt_agent.py
+++ b/src/control_backend/agents/user_interrupt/user_interrupt_agent.py
@@ -168,7 +168,7 @@ class UserInterruptAgent(BaseAgent):
                 new_phase_id = msg.body
                 self.logger.info(f"Phase transition detected: {new_phase_id}")
 
-                payload = {"type": "phase_update", "phase_id": new_phase_id}
+                payload = {"type": "phase_update", "id": new_phase_id}
 
                 await self._send_experiment_update(payload)
             case "goal_start":