diff --git a/adds-address-prefix-len-to-dhclient-cli.patch b/adds-address-prefix-len-to-dhclient-cli.patch
deleted file mode 100644
index bd786cb..0000000
--- a/adds-address-prefix-len-to-dhclient-cli.patch
+++ /dev/null
@@ -1,78 +0,0 @@
-From 3286e40ff01e78c172dfb0cdb684b58854af7604 Mon Sep 17 00:00:00 2001
-From: liuzhikang <liuzhikang3@huawei.com>
-Date: Thu, 31 Oct 2019 16:07:22 +0800
-
-Signed-off-by: liuzhikang <liuzhikang3@huawei.com>
----
- client/dhc6.c     |  3 ++-
- client/dhclient.c | 17 +++++++++++++++--
- 2 files changed, 17 insertions(+), 3 deletions(-)
-
-diff --git a/client/dhc6.c b/client/dhc6.c
-index 5460ee1..fe0057c 100644
---- a/client/dhc6.c
-+++ b/client/dhc6.c
-@@ -148,6 +148,7 @@ static int dhc6_score_lease(struct client_state *client,
- 
- extern int onetry;
- extern int stateless;
-+extern int address_prefix_len;
- 
- /*
-  * Assign DHCPv6 port numbers as a client.
-@@ -4364,7 +4365,7 @@ dhc6_marshall_values(const char *prefix, struct client_state *client,
- 				      (unsigned) addr->plen);
- 		} else {
- 			client_envadd(client, prefix, "ip6_prefixlen",
--				      "%d", DHCLIENT_DEFAULT_PREFIX_LEN);
-+				      "%d", address_prefix_len);
- 			client_envadd(client, prefix, "ip6_address",
- 				      "%s", piaddr(addr->address));
- 		}
-diff --git a/client/dhclient.c b/client/dhclient.c
-index 62b90cf..9f8ba06 100644
---- a/client/dhclient.c
-+++ b/client/dhclient.c
-@@ -108,6 +108,7 @@ int require_all_ias = 0;	/* If the user requires all of the IAs to
- 				   be available before accepting a lease
- 				   0 = no, 1 = requries */
- int dad_wait_time = 0;
-+int address_prefix_len = DHCLIENT_DEFAULT_PREFIX_LEN;
- char *mockup_relay = NULL;
- 
- char *progname = NULL;
-@@ -190,9 +191,11 @@ usage(const char *sfmt, const char *sarg)
- #ifdef DHCP4o6
- 		  "[-4|-6] [-SNTPRI1dvrxi] [-nw] -4o6 <port>] [-p <port>]\n"
- 		  "                [-D LL|LLT] [--dad-wait-time seconds]\n"
-+		  "                [--address-prefix-len length]\n"
- #else /* DHCP4o6 */
- 		  "[-4|-6] [-SNTPRI1dvrxi] [-nw] [-p <port>]\n"
--          "                [-D LL|LLT] [--dad-wait-time seconds]\n"
-+		  "                [-D LL|LLT] [--dad-wait-time seconds]\n"
-+		  "                [--address-prefix-len length]\n"
- #endif
- #else /* DHCPv6 */
- 		  "[-I1dvrxi] [-nw] [-p <port>] [-D LL|LLT] \n"
-@@ -452,7 +455,17 @@ main(int argc, char **argv) {
- 			if (errno || (*s != '\0') || (dad_wait_time < 0)) {
- 				usage("Invalid value for --dad-wait-time: %s", argv[i]);
- 			}
--
-+		} else if (!strcmp(argv[i], "--address-prefix-len")) {
-+			if (++i == argc) {
-+					 usage(use_noarg, argv[i-1]);
-+			}
-+			errno = 0;
-+			address_prefix_len = (int)strtol(argv[i], &s, 10);
-+			if (errno || (*s != '\0') ||
-+				(address_prefix_len < 0)) {
-+					usage("Invalid value for"
-+								" --address-prefix-len: %s", argv[i]);
-+			}
- #endif /* DHCPv6 */
- 		} else if (!strcmp(argv[i], "-D")) {
- 			duid_v4 = 1;
--- 
-2.19.1
-