diff --git a/src/window.c b/src/window.c
index dc63e09..47da663 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3106,6 +3106,10 @@
 {
     int		i;
 
+#ifdef FEAT_MZSCHEME
+    mzscheme_window_free(wp);
+#endif
+
 #ifdef FEAT_PERL
     perl_win_free(wp);
 #endif