diff --git a/library/DataDefs.cpp b/library/DataDefs.cpp
index 2de8c156e..7b4af8479 100644
--- a/library/DataDefs.cpp
+++ b/library/DataDefs.cpp
@@ -30,9 +30,10 @@ distribution.
 
 #include "dfhack/Process.h"
 #include "dfhack/Core.h"
-#include "dfhack/DataDefs.h"
 #include "dfhack/VersionInfo.h"
 #include "tinythread.h"
+// must be last due to MS stupidity
+#include "dfhack/DataDefs.h"
 
 using namespace DFHack;
 
diff --git a/library/include/dfhack/DataDefs.h b/library/include/dfhack/DataDefs.h
index aa325958c..5ffd9be7e 100644
--- a/library/include/dfhack/DataDefs.h
+++ b/library/include/dfhack/DataDefs.h
@@ -31,6 +31,11 @@ distribution.
 #include "dfhack/Core.h"
 #include "dfhack/BitArray.h"
 
+// Stop some MS stupidity
+#ifdef interface
+	#undef interface
+#endif
+
 namespace DFHack
 {
     class virtual_class {};