diff --git a/Core/FileSystems/FileSystem.h b/Core/FileSystems/FileSystem.h
index c9e7e0b0ad..92aa5f04e8 100644
--- a/Core/FileSystems/FileSystem.h
+++ b/Core/FileSystems/FileSystem.h
@@ -19,6 +19,7 @@
 
 #include <vector>
 #include <string>
+#include <cstring>
 
 #include "Core/HLE/sceKernel.h"