diff --git a/src/core/options.ts b/src/core/options.ts
index d8ccabea..b1f229ec 100644
--- a/src/core/options.ts
+++ b/src/core/options.ts
@@ -11,6 +11,7 @@ export const defaultOptions: Omit<Required<Options>, 'include' | 'exclude' | 'tr
   dts: isPackageExists('typescript'),
 
   directoryAsNamespace: false,
+  collapseSamePrefixes: false,
   globalNamespaces: [],
 
   resolvers: [],