diff --git a/make/tex.mk b/make/tex.mk
index fcefe729..6aa74e04 100644
--- a/make/tex.mk
+++ b/make/tex.mk
@@ -233,7 +233,7 @@ html_install: $(HTMLDIR)
 clean:
 	@echo "-- cleaning up ..."
 	rm -rf *.aux *.toc *.dvi *.pdf *.ps *~ *.log *.done *.rep \
-		*.lol \
+		*.lol *.bak \
 		$(NEWDIRS) $(PRE_TEX) $(PRE_HTML) $(OUTPUT).txt \
 		$(LOCAL_IMPORTED_TEMPLATES) \
 		$(GERFROMLINETMPL) $(TEXFROMGER) $(EPSFROMFIG)