diff --git a/packages/types/src/codec/Struct.spec.ts b/packages/types/src/codec/Struct.spec.ts
index 5557307be3..0a38efdae5 100644
--- a/packages/types/src/codec/Struct.spec.ts
+++ b/packages/types/src/codec/Struct.spec.ts
@@ -154,7 +154,7 @@ describe('Struct', (): void => {
     ).toEqual({
       foo: 'Text',
       bar: 'Text',
-      baz: 'U32'
+      baz: 'u32'
     });
   });
 
diff --git a/packages/types/src/codec/Struct.ts b/packages/types/src/codec/Struct.ts
index 5141fc972b..cfa8737bb5 100644
--- a/packages/types/src/codec/Struct.ts
+++ b/packages/types/src/codec/Struct.ts
@@ -158,7 +158,7 @@ export default class Struct<
     return (Object
       .entries(this._Types) as [keyof S, Constructor][])
       .reduce((result: E, [key, Type]): E => {
-        (result as any)[key] = Type.name;
+        (result as any)[key] = new Type().toRawType();
 
         return result;
       }, {} as unknown as E);
diff --git a/packages/types/src/codec/Tuple.spec.ts b/packages/types/src/codec/Tuple.spec.ts
index 7fecaec01a..3cc0d5b0a2 100644
--- a/packages/types/src/codec/Tuple.spec.ts
+++ b/packages/types/src/codec/Tuple.spec.ts
@@ -79,7 +79,7 @@ describe('Tuple', (): void => {
   });
 
   it('exposes the Types', (): void => {
-    expect(tuple.Types).toEqual(['Text', 'U32']);
+    expect(tuple.Types).toEqual(['Text', 'u32']);
   });
 
   it('exposes the Types (object creation)', (): void => {
diff --git a/packages/types/src/codec/Tuple.ts b/packages/types/src/codec/Tuple.ts
index e0fe45ca5d..6c93aefa2b 100644
--- a/packages/types/src/codec/Tuple.ts
+++ b/packages/types/src/codec/Tuple.ts
@@ -80,7 +80,7 @@ export default class Tuple extends AbstractArray<Codec> {
    */
   public get Types (): string[] {
     return Array.isArray(this._Types)
-      ? this._Types.map(({ name }): string => name)
+      ? this._Types.map((Type): string => new Type().toRawType())
       : Object.keys(this._Types);
   }