diff --git a/tutorial/Makefile b/tutorial/Makefile
index e05ce825e3f7d3dc187be85032da648754b2a3d9..928d222b1f9f6a2d675c46f9ebcc00a7cdeeca1a 100644
--- a/tutorial/Makefile
+++ b/tutorial/Makefile
@@ -102,7 +102,8 @@ the_image_module.html: Image.wmml the_image_module.wmml
 	$(pike) ./wmmltohtml2 the_image_module.wmml mirar_html the_image_module
 
 clean:
-	-rm -f *.html *.md $(MADEFILES) 
+	-rm -f *.html *.md $(MADEFILES)
+	-rm -f illustration*.*
 	-rm -f tutorial.dvi tutorial.tex tutorial.aux
 	-rm -f tutorial.log tutorial.toc
 	-rm -f latex.wcache pdflatex.wcache illustration_cache image_cache gfx/* execute_cache