diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index ee432b13240..f9b416fc4de 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -3544,6 +3544,7 @@ namespace ts {
 
     export interface ResolvedModuleWithFailedLookupLocations {
         resolvedModule: ResolvedModuleFull | undefined;
+        /* @internal */
         failedLookupLocations: string[];
     }