diff --git a/cpp/runtime/buffer/LocalMemoryBufferPool.cpp b/cpp/runtime/buffer/LocalMemoryBufferPool.cpp
index 28bfca682973c9482c75e201f8d8133259329590..06d8973349f0a9adeea6d5a1929c7280a4991ae5 100644
--- a/cpp/runtime/buffer/LocalMemoryBufferPool.cpp
+++ b/cpp/runtime/buffer/LocalMemoryBufferPool.cpp
@@ -284,7 +284,7 @@ namespace datastream {
 
             if (targetChannel != UNKNOWN_CHANNEL) {
                 if (++subpartitionBuffersCount_[targetChannel] == maxBuffersPerChannel_) {
-                    unavailableSubpartitionsCount_++;
+                    unavailableSubpartitionsCount++;
                 }
             }