diff --git a/packages/api/src/router/allocation-assignment-procedures.ts b/packages/api/src/router/allocation-assignment-procedures.ts
index a19e592..932574f 100644
--- a/packages/api/src/router/allocation-assignment-procedures.ts
+++ b/packages/api/src/router/allocation-assignment-procedures.ts
@@ -268,12 +268,15 @@ export const allocationAssignmentProcedures = {
         return updatedAllocation;
       });
 
+      const affectedResourceIds = [existing.entry.resourceId, updated.resourceId].filter(
+        (resourceId): resourceId is string => Boolean(resourceId),
+      );
+
       publishAllocationUpdated(ctx.db, {
         id: updated.id,
         projectId: updated.projectId,
         resourceId: updated.resourceId,
-        resourceIds: [existing.entry.resourceId, updated.resourceId]
-          .filter((resourceId): resourceId is string => Boolean(resourceId)),
+        resourceIds: affectedResourceIds,
       });
 
       return updated;