diff --git a/ndn-handle/write-handle.cpp b/ndn-handle/write-handle.cpp
index eba46c5..3b1d048 100644
--- a/ndn-handle/write-handle.cpp
+++ b/ndn-handle/write-handle.cpp
@@ -203,7 +203,7 @@
 
   if (parameter.hasEndBlockId()) {
     initialCredit =
-      std::min(initialCredit, parameter.getEndBlockId() - parameter.getStartBlockId());
+      std::min(initialCredit, parameter.getEndBlockId() - parameter.getStartBlockId() + 1);
   }
   else {
     // set noEndTimeout timer