diff --git a/make/tex.mk b/make/tex.mk
index 9a68531d..73ab1422 100644
--- a/make/tex.mk
+++ b/make/tex.mk
@@ -308,7 +308,7 @@ html_install: $(HTMLDIR)
 
 clean:
 	@echo "-- cleaning up ..."
-	rm -rf *.aux *.toc *.dvi *.pdf *.ps *~ *.log *.done *.rep *.nav *.snm \
+	rm -rf *.aux *.toc *.dvi *.pdf *.ps *~ *.log *.done *.rep *.nav *.snm *.tdo \
 		*.4ct *.4tc *.4of *.4oo *.4os *.4og */*.4og *.css *.html *.idv *.lg *.xref *.odt \
 		*.lol *.bak *.idx *.ilg *.ind *.out *.brf .\#* \#* \
 		$(NEWDIRS) $(OUTPUT).txt \