diff --git a/dfhack/python/DF_GUI.cpp b/dfhack/python/DF_GUI.cpp
index e289b7650..5e9d064de 100644
--- a/dfhack/python/DF_GUI.cpp
+++ b/dfhack/python/DF_GUI.cpp
@@ -26,6 +26,7 @@ distribution.
 #define __DFGUI__
 
 #include "Python.h"
+#include "DFTypes.h"
 #include "modules/Gui.h"
 
 using namespace DFHack;