diff --git a/src/win32.cpp b/src/win32.cpp
--- a/src/win32.cpp
+++ b/src/win32.cpp
@@ -11,6 +11,7 @@
 #include "saveload.h"
 #include "string.h"
 #include "gfx.h"
+#include "textbuf_gui.h"
 #include "fileio.h"
 #include <windows.h>
 #include <winnt.h>