diff --git a/LGPL/Makefile.in b/LGPL/Makefile.in
index ea96f59cb..333df6ae4 100644
--- a/LGPL/Makefile.in
+++ b/LGPL/Makefile.in
@@ -26,7 +26,6 @@ YAP_EXTRAS=@YAP_EXTRAS@
 
 PROGRAMS= $(srcdir)/debug.pl \
 	$(srcdir)/maplist.pl \
-	$(srcdir)/nb_rbtrees.yap \
 	$(srcdir)/operators.pl \
 	$(srcdir)/option.pl \
 	$(srcdir)/prolog_source.pl \