diff --git a/2001/herrmann1/Makefile b/2001/herrmann1/Makefile
index f1c5be169..3fb39c5df 100644
--- a/2001/herrmann1/Makefile
+++ b/2001/herrmann1/Makefile
@@ -201,7 +201,7 @@ clean:
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
-	${RM} -rf *.dSYM
+	${RM} -rf *.dSYM error herrmann1-1.c herrmann1-3.c
 	@-if [ -e sandwich ]; then \
 	    ${RM} -f sandwich; \
 	    echo 'ate sandwich'; \