diff --git a/debug.cpp b/debug.cpp
index b63d5c5..10eccc5 100644
--- a/debug.cpp
+++ b/debug.cpp
@@ -1,5 +1,6 @@
 #include "debug.h"
 #include <SDL2/SDL.h>
+#include <cstring>
 #include "sm83.h"
 #include "sm83dis.h"
 #include "mem.h"
diff --git a/gbscreen.cpp b/gbscreen.cpp
index 9773506..3addeea 100644
--- a/gbscreen.cpp
+++ b/gbscreen.cpp
@@ -1,4 +1,5 @@
 #include "gbscreen.h"
+#include <cstring>
 #include "sm83.h"
 #include "mem.h"
 #include "audio_viewer.h"
diff --git a/ui.cpp b/ui.cpp
index abbda53..a5f3f21 100644
--- a/ui.cpp
+++ b/ui.cpp
@@ -1,5 +1,6 @@
 #include "ui.h"
 #include <SDL2/SDL.h>
+#include <cstring>
 
 namespace ui
 {