diff --git a/api/src/main/kotlin/com/wbrawner/twigs/RecurringTransactionsApi.kt b/api/src/main/kotlin/com/wbrawner/twigs/RecurringTransactionsApi.kt
index 3d89b64..180bd06 100644
--- a/api/src/main/kotlin/com/wbrawner/twigs/RecurringTransactionsApi.kt
+++ b/api/src/main/kotlin/com/wbrawner/twigs/RecurringTransactionsApi.kt
@@ -23,7 +23,7 @@ data class RecurringTransactionResponse(
     val description: String?,
     val frequency: String,
     val start: String,
-    val finish: String? = null,
+    val finish: String?,
     val amount: Long?,
     val expense: Boolean?,
     val budgetId: String,
@@ -37,7 +37,7 @@ fun RecurringTransaction.asResponse(): RecurringTransactionResponse = RecurringT
     description = description,
     frequency = frequency.toString(),
     start = start.toString(),
-    finish = finish.toString(),
+    finish = finish?.toString(),
     amount = amount,
     expense = expense,
     budgetId = budgetId,