diff --git a/1989/westley/Makefile b/1989/westley/Makefile
index de409993f..90d566869 100644
--- a/1989/westley/Makefile
+++ b/1989/westley/Makefile
@@ -182,6 +182,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
+	${RM} -f ver0.c ver1.c ver2.c ver3.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \