diff --git a/src/lib/features/release-plans/release-plan-milestone.ts b/src/lib/features/release-plans/release-plan-milestone.ts
index 7f677085f2..b13f92ddd0 100644
--- a/src/lib/features/release-plans/release-plan-milestone.ts
+++ b/src/lib/features/release-plans/release-plan-milestone.ts
@@ -6,6 +6,6 @@ export interface ReleasePlanMilestone {
     sortOrder: number;
     releasePlanDefinitionId: string;
     startedAt?: string;
-    transitionCondition?: object;
+    transitionCondition?: { intervalMinutes: number };
     strategies?: ReleasePlanMilestoneStrategy[];
 }