diff --git a/frontend/fbank.h b/frontend/fbank.h
index bc696e4..6530e84 100644
--- a/frontend/fbank.h
+++ b/frontend/fbank.h
@@ -22,12 +22,9 @@
 #include <vector>
 
 #include "frontend/fft.h"
-#ifndef FST_LOG_H_
-#include "fst/log.h"
-#endif
+#include "glog/logging.h"
 
 namespace wenet {
-using namespace fst;
 // This code is based on kaldi Fbank implementation, please see
 // https://github.com/kaldi-asr/kaldi/blob/master/src/feat/feature-fbank.cc
 
diff --git a/frontend/feature_pipeline.cc b/frontend/feature_pipeline.cc
index dda7a01..b8c7b06 100644
--- a/frontend/feature_pipeline.cc
+++ b/frontend/feature_pipeline.cc
@@ -18,7 +18,6 @@
 #include <utility>
 
 namespace wenet {
-    using namespace fst;
     FeaturePipeline::FeaturePipeline(const FeaturePipelineConfig& config)
     : config_(config),
       feature_dim_(config.num_bins),
diff --git a/frontend/feature_pipeline.h b/frontend/feature_pipeline.h
index 048134b..27e6d32 100644
--- a/frontend/feature_pipeline.h
+++ b/frontend/feature_pipeline.h
@@ -73,7 +73,7 @@ struct FeaturePipelineConfig {
   }
 
   void Info() const {
-    LOG(INFO) << "feature pipeline config"
+    google::LOG(INFO) << "feature pipeline config"
               << " num_bins " << num_bins << " frame_length " << frame_length
               << " frame_shift " << frame_shift << " low_freq " << low_freq
               << " preemphasis " << pre_emphasis << " log_floor " << log_floor