diff --git a/kaldifeat/csrc/CPPLINT.cfg b/kaldifeat/csrc/CPPLINT.cfg
new file mode 100644
index 0000000..00c8d23
--- /dev/null
+++ b/kaldifeat/csrc/CPPLINT.cfg
@@ -0,0 +1 @@
+exclude_files=whisper-mel-bank.h
diff --git a/kaldifeat/csrc/whisper-fbank.h b/kaldifeat/csrc/whisper-fbank.h
index b5116c1..1216415 100644
--- a/kaldifeat/csrc/whisper-fbank.h
+++ b/kaldifeat/csrc/whisper-fbank.h
@@ -19,6 +19,7 @@
 #ifndef KALDIFEAT_CSRC_WHISPER_FBANK_H_
 #define KALDIFEAT_CSRC_WHISPER_FBANK_H_
 
+#include <string>
 #include <vector>
 
 #include "kaldifeat/csrc/feature-common.h"