diff --git a/lite/api/cxx_api.h b/lite/api/cxx_api.h
index 92e17128c0c2a2abcb36a54911cb8d5fdf3d5af0..c3339686aa9c3e7960224b2d674820f71817dc79 100644
--- a/lite/api/cxx_api.h
+++ b/lite/api/cxx_api.h
@@ -256,8 +256,8 @@ class CxxPaddleApiImpl : public lite_api::PaddlePredictor {
   bool status_is_cloned_;
 #ifdef LITE_WITH_CUDA
   bool multi_stream_{false};
-  cudaStream_t* io_stream_;
-  cudaStream_t* exec_stream_;
+  cudaStream_t* io_stream_{nullptr};
+  cudaStream_t* exec_stream_{nullptr};
   cudaEvent_t input_event_;
   std::vector<cudaEvent_t> output_events_;
   // only for multi exec stream mode.