diff --git a/src/whisper.cpp b/src/whisper.cpp
index 39c53ba23..a49eb59aa 100644
--- a/src/whisper.cpp
+++ b/src/whisper.cpp
@@ -21,14 +21,12 @@
 #define _USE_MATH_DEFINES
 #include <cmath>
 #include <climits>
-#include <codecvt>
 #include <cstdarg>
 #include <cstdio>
 #include <cstring>
 #include <fstream>
 #include <functional>
 #include <map>
-#include <mutex>
 #include <random>
 #include <regex>
 #include <set>
@@ -36,6 +34,10 @@
 #include <thread>
 #include <vector>
 
+#ifdef _MSC_VER
+#include <codecvt>
+#endif
+
 #if defined(WHISPER_BIG_ENDIAN)
 template<typename T>
 static T byteswap(T value) {