diff --git a/packages/metadata/src/Metadata/util/validateTypes.ts b/packages/metadata/src/Metadata/util/validateTypes.ts
index ce687d0526..c07389eec9 100644
--- a/packages/metadata/src/Metadata/util/validateTypes.ts
+++ b/packages/metadata/src/Metadata/util/validateTypes.ts
@@ -25,11 +25,10 @@ function extractTypes (types: string[]): any[] {
       case TypeDefInfo.VecFixed:
         return extractTypes([(decoded.ext as TypeDefExtVecFixed).type]);
 
+      case TypeDefInfo.BTreeMap:
       case TypeDefInfo.Result:
       case TypeDefInfo.Tuple:
-        return extractTypes(
-          (decoded.sub as TypeDef[]).map((sub): string => sub.type)
-        );
+        return extractTypes((decoded.sub as TypeDef[]).map((sub): string => sub.type));
 
       default:
         throw new Error(`Unhandled: Unable to create and validate type from ${type}`);