diff --git a/src/main/kotlin/OneDriveTransferCenter.kt b/src/main/kotlin/OneDriveTransferCenter.kt
index 3bdb775..2e94b8c 100644
--- a/src/main/kotlin/OneDriveTransferCenter.kt
+++ b/src/main/kotlin/OneDriveTransferCenter.kt
@@ -268,7 +268,7 @@ class OneDriveTransferTaskExecutor(
     private val chunkSize: Int = 26
 ) : ThreadPoolExecutor(
     threadNum, threadNum, 0, TimeUnit.SECONDS,
-    ArrayBlockingQueue(50),
+    ArrayBlockingQueue(threadNum * 2),
     ThreadFactoryBuilder()
         .setNameFormat("Transfer Worker %d")
         .build()