diff --git a/specifications/api/swagger.yaml b/specifications/api/swagger.yaml
index 2f12f78d606..f72cb0a52f8 100644
--- a/specifications/api/swagger.yaml
+++ b/specifications/api/swagger.yaml
@@ -641,7 +641,7 @@ x-transactionChange: &transactionChange
 x-transactionResolvedInputs: &transactionResolvedInputs
   description: A list of transaction inputs
   type: array
-  minItems: 0
+  minItems: 1
   items:
     type: object
     required: