diff --git a/lite/api/light_api.cc b/lite/api/light_api.cc
index 9d092a6d385fabde1379b2abecb02daa3270b883..fbcf171726d741ef0073f423bc4a600c9f9389d0 100644
--- a/lite/api/light_api.cc
+++ b/lite/api/light_api.cc
@@ -33,6 +33,7 @@ void LightPredictor::Build(const std::string& lite_model_file,
   DequantizeWeight();
   BuildRuntimeProgram(program_desc_);
   PrepareFeedFetch();
+  program_desc_.reset();
 }
 
 void LightPredictor::Build(const std::string& model_dir,