diff --git a/Makefile b/Makefile
index c3b83e8f8e9c7fd880aeb4685b9f13c001fd41bd..dc9bd368a40a77ef9ba997c0abcd159642aae030 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,9 @@ all: $(BOOK).pdf
 
 clean:
 	rm -fr *.aux *.sls *.slo *.slg *.toc *.acn *.log *.out *.idx *.ist *.glo *.glg *.gls *.acr *.alg \
+	*.ilg \
+	*.ind \
+	*.ptc \
 	*.pdf \
 	svg-inkscape \
 	*.fdb_latexmk \