diff --git a/services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crt/S3CrtResponseHandlerAdapter.java b/services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crt/S3CrtResponseHandlerAdapter.java
index 4ce393a90821..f743c0f3bc3c 100644
--- a/services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crt/S3CrtResponseHandlerAdapter.java
+++ b/services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/crt/S3CrtResponseHandlerAdapter.java
@@ -69,6 +69,7 @@ public int onResponseBody(ByteBuffer bodyBytesIn, long objectRangeStart, long ob
             return 0;
         }
 
+        int bytesReceived = bodyBytesIn.remaining();
         CompletableFuture<Void> writeFuture = responsePublisher.send(bodyBytesIn);
 
         writeFuture.whenComplete((result, failure) -> {
@@ -77,7 +78,7 @@ public int onResponseBody(ByteBuffer bodyBytesIn, long objectRangeStart, long ob
                 return;
             }
 
-            metaRequest.incrementReadWindow(bodyBytesIn.remaining());
+            metaRequest.incrementReadWindow(bytesReceived);
         });
 
         // Returning 0 to disable flow control because we manually increase read window above