diff --git a/schema.graphql b/schema.graphql
index 11e467b4..b8da4443 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -277,7 +277,7 @@ type OutstandingOrder @entity {
   account: Account! @index #Account @index
   pool: Pool! @index
   tranche: Tranche! @index
-  epochNumber: Int!
+  epochNumber: Int
   timestamp: Date!
 
   investAmount: BigInt!