diff --git a/proxy.h b/proxy.h
index 3ffbe4e..7f70db3 100644
--- a/proxy.h
+++ b/proxy.h
@@ -4,6 +4,7 @@
 #ifndef _MSFT_PROXY_
 #define _MSFT_PROXY_
 
+#include <cstring>
 #include <bit>
 #include <concepts>
 #include <initializer_list>