diff --git a/paddle/fluid/inference/tests/book/test_inference_nlp.cc b/paddle/fluid/inference/tests/book/test_inference_nlp.cc
index 9dcd79c3bb9ed713ff0f12024969cc5798750988..4dc576cede06ac8c35cba92ed3267f6043c8f0c5 100644
--- a/paddle/fluid/inference/tests/book/test_inference_nlp.cc
+++ b/paddle/fluid/inference/tests/book/test_inference_nlp.cc
@@ -29,6 +29,7 @@ DEFINE_string(data_file, "", "File of input index data.");
 DEFINE_int32(repeat, 100, "Running the inference program repeat times");
 DEFINE_bool(prepare_vars, true, "Prepare variables before executor");
 DEFINE_int32(num_threads, 1, "Number of threads should be used");
+DECLARE_bool(use_mkldnn);
 
 inline double GetCurrentMs() {
   struct timeval time;