diff --git a/packages/demo-protobuf/src/decorator.spec.ts b/packages/demo-protobuf/src/decorator.spec.ts
index 0cd267d0..53344027 100644
--- a/packages/demo-protobuf/src/decorator.spec.ts
+++ b/packages/demo-protobuf/src/decorator.spec.ts
@@ -32,7 +32,7 @@ describe("decorator demo", () => {
       @CosmosField.Int64(4)
       public readonly int64Demo?: number;
 
-      @CosmosField.UInt64(5)
+      @CosmosField.Uint64(5)
       public readonly uint64Demo?: number;
 
       @CosmosField.RepeatedString(6)
diff --git a/packages/demo-protobuf/src/decorator.ts b/packages/demo-protobuf/src/decorator.ts
index da09fddf..11748e41 100644
--- a/packages/demo-protobuf/src/decorator.ts
+++ b/packages/demo-protobuf/src/decorator.ts
@@ -22,7 +22,7 @@ export const CosmosField = {
   Bytes: (id: number) => Field.d<Uint8Array>(id, "bytes"),
 
   Int64: (id: number) => Field.d<number>(id, "int64"),
-  UInt64: (id: number) => Field.d<number>(id, "uint64"),
+  Uint64: (id: number) => Field.d<number>(id, "uint64"),
 
   RepeatedString: (id: number) => Field.d<string[]>(id, "string", "repeated"),
   Nested: (id: number, ctor: Constructor<Message<{}>>) => Field.d(id, ctor),
diff --git a/packages/demo-protobuf/types/decorator.d.ts b/packages/demo-protobuf/types/decorator.d.ts
index ecc80646..dd9dbd94 100644
--- a/packages/demo-protobuf/types/decorator.d.ts
+++ b/packages/demo-protobuf/types/decorator.d.ts
@@ -6,7 +6,7 @@ export declare const CosmosField: {
   String: (id: number) => import("protobufjs").FieldDecorator;
   Bytes: (id: number) => import("protobufjs").FieldDecorator;
   Int64: (id: number) => import("protobufjs").FieldDecorator;
-  UInt64: (id: number) => import("protobufjs").FieldDecorator;
+  Uint64: (id: number) => import("protobufjs").FieldDecorator;
   RepeatedString: (id: number) => import("protobufjs").FieldDecorator;
   Nested: (id: number, ctor: Constructor<Message<{}>>) => import("protobufjs").FieldDecorator;
 };