diff --git a/lite/backends/fpga/KD/io.hpp b/lite/backends/fpga/KD/io.hpp
index 408c6c1765a83b3f54329ac0baea841ae17996e6..ef828da41c50c9d5085a6696a89c76334a73a21f 100644
--- a/lite/backends/fpga/KD/io.hpp
+++ b/lite/backends/fpga/KD/io.hpp
@@ -38,9 +38,9 @@ class FpgaIO {
   // void unlock();
 
  private:
-  std::mutex* mtx_ = nullptr;
-  std::condition_variable* condition_ = nullptr;
-  bool locked_ = false;
+  // std::mutex* mtx_ = nullptr;
+  // std::condition_variable* condition_ = nullptr;
+  // bool locked_ = false;
 
   float* data_ = nullptr;