1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index ab67cbc..d89b105 100644
--- a/Makefile
+++ b/Makefile
@@ -43,7 +43,7 @@ endif
 
 SRC := ../
 
-MODULES := main malloc ustring error help licence version misc
+MODULES := main malloc ustring error help licence version misc tree23
 MODULES += input keywords contents index style biblio
 
 OBJECTS := $(addsuffix .o,$(MODULES))