1 files changed, 1 insertions, 1 deletions
diff --git a/src/fields/Schema.ts b/src/fields/Schema.ts
index 7217bec37..89e5cda8d 100644
--- a/src/fields/Schema.ts
+++ b/src/fields/Schema.ts
@@ -53,7 +53,7 @@ export function makeInterface<T extends Interface[]>(...schemas: T): InterfaceFu
                         if (doc instanceof Doc) {
                             return desc(doc);
                         }
-                        return doc.then(doc => doc && desc(doc));
+                        return doc.then(d => d && desc(d));
                     }
                     return Cast(field, desc);
                 }