diff --git a/gramps/doc/gramps-manual/C/Makefile.in b/gramps/doc/gramps-manual/C/Makefile.in
index 4c8652daa..6cdc9fac0 100644
--- a/gramps/doc/gramps-manual/C/Makefile.in
+++ b/gramps/doc/gramps-manual/C/Makefile.in
@@ -25,4 +25,5 @@ uninstall:
 
 clean:
 	-rm -f ${MANDIR}/*.html
+	-rm -rf ${MANDIR}/stylesheet-images/
 	-rm -rf ${MANDIR}.junk/