diff --git a/schema.graphql b/schema.graphql
index 5946cdf..59728b6 100644
--- a/schema.graphql
+++ b/schema.graphql
@@ -100,7 +100,7 @@ type Upgrade @entity {
   # End – default data block
 
   impl: Bytes
-  version: String
+  version: String!
   type: String
 }
 
diff --git a/src/ERC1155Mappings/factoryMappings.ts b/src/ERC1155Mappings/factoryMappings.ts
index 02b04ce..ef87cd4 100644
--- a/src/ERC1155Mappings/factoryMappings.ts
+++ b/src/ERC1155Mappings/factoryMappings.ts
@@ -113,7 +113,7 @@ export function handle1155FactoryUpgraded(event: Upgraded): void {
   upgrade.block = event.block.number;
   upgrade.timestamp = event.block.timestamp;
   upgrade.impl = event.params.implementation;
-  upgrade.version = creator.contractVersion()
+  upgrade.version = creator.contractVersion();
   upgrade.address = event.address;
   upgrade.type = "1155Factory";