diff --git a/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java b/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
index 3158295c68b..4c41e4050c4 100644
--- a/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
+++ b/aws-android-sdk-s3/src/main/java/com/amazonaws/mobileconnectors/s3/transferutility/TransferThreadPool.java
@@ -41,7 +41,8 @@ static synchronized void init(final int transferThreadPoolSize) {
             executorMainTask = buildExecutor(poolSize);
         }
         if (executorPartTask == null) {
-            executorPartTask = buildExecutor(poolSize);
+            // Upload individual parts serially
+            executorPartTask = buildExecutor(1);
         }
     }