diff --git a/utils/tex2rtf/src/maths.cpp b/utils/tex2rtf/src/maths.cpp
index e951fea6a0..70fc726cf7 100644
--- a/utils/tex2rtf/src/maths.cpp
+++ b/utils/tex2rtf/src/maths.cpp
@@ -6,14 +6,16 @@
  */
 
 // For compilers that support precompilation, includes "wx.h".
+#ifdef WX_PRECOMP
 #include "wx_prec.h"
+#endif
 
 #ifdef __BORLANDC__
 #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include <wx.h>
+#include <wx/wx.h>
 #endif
 
 #include <ctype.h>