diff --git a/typings/internalBinding/types.d.ts b/typings/internalBinding/types.d.ts
index 6d01da4b535ed4..4ed3a56f5fa64d 100644
--- a/typings/internalBinding/types.d.ts
+++ b/typings/internalBinding/types.d.ts
@@ -9,7 +9,7 @@ declare function InternalBinding(binding: 'types'): {
   isExternal(value: unknown): value is Object,
   isMap(value: unknown): value is Map<unknown, unknown>,
   isMapIterator: (value: unknown) => value is IterableIterator<unknown>,
-  isModuleNamespaceObject: (value: unknown) => value is {[Symbol.toStringTag]: 'Module', [key: string]: any},
+  isModuleNamespaceObject: (value: unknown) => value is { [Symbol.toStringTag]: 'Module' },
   isNativeError: (value: unknown) => Error,
   isPromise: (value: unknown) => value is Promise<unknown>,
   isSet: (value: unknown) => value is Set<unknown>,