diff --git a/src/structs.h b/src/structs.h
index 8e4f49a..4f3b11f 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1209,12 +1209,16 @@
     int		b_shortname;	/* this file has an 8.3 file name */
 #endif
 
+#ifdef FEAT_MZSCHEME
+    void	*mzscheme_ref;	/* The MzScheme reference to this buffer */
+#endif
+
 #ifdef FEAT_PERL
     void	*perl_private;
 #endif
 
 #ifdef FEAT_PYTHON
-    void	*python_ref;	/* The Python value referring to this buffer */
+    void	*python_ref;	/* The Python reference to this buffer */
 #endif
 
 #ifdef FEAT_TCL
@@ -1591,6 +1595,11 @@
     int		w_nrwidth_width;	/* nr of chars to print line count. */
 #endif
 
+
+#ifdef FEAT_MZSCHEME
+    void	    *mzscheme_ref;	/* The MzScheme value referring to this window */
+#endif
+
 #ifdef FEAT_PERL
     void	*perl_private;
 #endif