diff --git a/doc/scsh-manual/Makefile b/doc/scsh-manual/Makefile
index 0eee6c5..d23bc32 100644
--- a/doc/scsh-manual/Makefile
+++ b/doc/scsh-manual/Makefile
@@ -24,7 +24,7 @@ man.pdf: $(TEX) man.ind
 	makeindex $<
 
 clean:
-	-rm -f *.log *.png man.out 
+	-rm -f *.log *.png man.out man.dvi man.ps man.pdf thumb*.png
 	rm -rf html
 
 INSTALL_DATA= install -c -m 644