diff --git a/packages/plugin-npm/sources/npmHttpUtils.ts b/packages/plugin-npm/sources/npmHttpUtils.ts
index 1be87ed0fe49..2cc809058fea 100644
--- a/packages/plugin-npm/sources/npmHttpUtils.ts
+++ b/packages/plugin-npm/sources/npmHttpUtils.ts
@@ -191,7 +191,7 @@ function pickPackageMetadata(metadata: PackageMetadata): PackageMetadata {
 /**
  * Used to invalidate the on-disk cache when the format changes.
  */
-export const CACHE_VERSION = 1;
+const CACHE_VERSION = 1;
 
 function getRegistryFolder(configuration: Configuration, registry: string) {
   const metadataFolder = getMetadataFolder(configuration);