diff --git a/kaldifeat/python/csrc/utils.cc b/kaldifeat/python/csrc/utils.cc
index 8fb8eae..76f47aa 100644
--- a/kaldifeat/python/csrc/utils.cc
+++ b/kaldifeat/python/csrc/utils.cc
@@ -4,6 +4,8 @@
 
 #include "kaldifeat/python/csrc/utils.h"
 
+#include <string>
+
 #include "kaldifeat/csrc/feature-window.h"
 
 #define FROM_DICT(type, key)         \