diff --git a/src/core/tls.h b/src/core/tls.h
index d1d490465..e9e2b9e6a 100644
--- a/src/core/tls.h
+++ b/src/core/tls.h
@@ -3,10 +3,9 @@
 
 #pragma once
 
+#include <cstring>
 #include "common/types.h"
 
-void* memset(void* ptr, int value, size_t num);
-
 namespace Xbyak {
 class CodeGenerator;
 }