diff --git a/src/cassettein.cpp b/src/cassettein.cpp
index e0b2e31..34617cb 100644
--- a/src/cassettein.cpp
+++ b/src/cassettein.cpp
@@ -19,6 +19,7 @@
 #include <fstream>
 #include <iostream>
 #include <cstdlib>
+#include <cstring>
 #include <SDL2/SDL_audio.h>
 #include <SDL2/SDL_log.h>
 #include "tinyfiledialogs.h"