diff --git a/src/util/httpRequest.ts b/src/util/httpRequest.ts
index 3bba03de33f..1b9ef977053 100644
--- a/src/util/httpRequest.ts
+++ b/src/util/httpRequest.ts
@@ -85,7 +85,7 @@ function doDownload(url: string, destination: string, redirectCount: number, opt
             .pipe(fileOut)
         }
 
-        fileOut.on("finish", callback)
+        fileOut.on("finish", () => (<any>fileOut.close)(callback))
       })
       .catch(callback)