diff --git a/httplib.h b/httplib.h
index d29ff85291..09614fa22a 100644
--- a/httplib.h
+++ b/httplib.h
@@ -198,6 +198,9 @@ using socket_t = SOCKET;
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
+#if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
+#include <strings.h>
+#endif
 
 using socket_t = int;
 #ifndef INVALID_SOCKET