diff --git a/packages/artifact/src/internal/upload/zip.ts b/packages/artifact/src/internal/upload/zip.ts
index 7516e62a..89abf59a 100644
--- a/packages/artifact/src/internal/upload/zip.ts
+++ b/packages/artifact/src/internal/upload/zip.ts
@@ -7,7 +7,7 @@ import {UploadZipSpecification} from './upload-zip-specification'
 import {getUploadChunkSize} from '../shared/config'
 
 export const DEFAULT_COMPRESSION_LEVEL = 6
-export var isRunning = false
+let isRunning = false
 
 // Custom stream transformer so we can set the highWaterMark property
 // See https://github.com/nodejs/node/issues/8855