diff --git a/src/lib/dhcp/dhcp4.h b/src/lib/dhcp/dhcp4.h
index 982e987d3b..5bb5223915 100644
--- a/src/lib/dhcp/dhcp4.h
+++ b/src/lib/dhcp/dhcp4.h
@@ -173,7 +173,10 @@ enum DHCPOptionType {
     // 109-111 are removed/unassigned
     DHO_NETINFO_ADDR                 = 112, /* RFC3679 */
     DHO_NETINFO_TAG                  = 113, /* RFC3679 */
-    DHO_URL                          = 114, /* RFC3679 */
+    // URL option was replaced with captive portal.
+    // DHO_URL                       = 114, /* RFC3679 */
+    DHO_V4_CAPTIVE_PORTAL            = 114, /* RFC8910 */
+
     // 115 is removed/unassigned
     DHO_AUTO_CONFIG                  = 116, /* RFC2563 */
     DHO_NAME_SERVICE_SEARCH          = 117, /* RFC2937 */
@@ -209,7 +212,6 @@ enum DHCPOptionType {
 //  DHO_DATA_SOURCE                  = 157,
 //  DHO_V4_PCP_SERVER                = 158,
     DHO_V4_PORTPARAMS                = 159,
-    DHO_V4_CAPTIVE_PORTAL            = 160,
     // 161-209 are removed/unassigned
 //  DHO_PATH_PREFIX                  = 210, /* RFC5071 */
 //  DHO_REBOOT_TIME                  = 211, /* RFC5071 */
diff --git a/src/lib/dhcp/std_option_defs.h b/src/lib/dhcp/std_option_defs.h
index fdd6e6e2c1..55eedd63ca 100644
--- a/src/lib/dhcp/std_option_defs.h
+++ b/src/lib/dhcp/std_option_defs.h
@@ -309,8 +309,8 @@ const OptionDefParams STANDARD_V4_OPTION_DEFINITIONS[] = {
       OPT_IPV4_ADDRESS_TYPE, true, NO_RECORD_DEF, "" },
     { "netinfo-server-tag", DHO_NETINFO_TAG, DHCP4_OPTION_SPACE,
       OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
-    { "default-url", DHO_URL, DHCP4_OPTION_SPACE, OPT_STRING_TYPE, false,
-      NO_RECORD_DEF, "" },
+    { "v4-captive-portal", DHO_V4_CAPTIVE_PORTAL, DHCP4_OPTION_SPACE,
+      OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
     { "auto-config", DHO_AUTO_CONFIG, DHCP4_OPTION_SPACE, OPT_UINT8_TYPE,
       false, NO_RECORD_DEF, "" },
     { "name-service-search", DHO_NAME_SERVICE_SEARCH, DHCP4_OPTION_SPACE,
@@ -347,8 +347,6 @@ const OptionDefParams STANDARD_V4_OPTION_DEFINITIONS[] = {
       true, RECORD_DEF(V4_RDNSS_SELECT_RECORDS), "" },
     { "v4-portparams", DHO_V4_PORTPARAMS, DHCP4_OPTION_SPACE, OPT_RECORD_TYPE,
       false, RECORD_DEF(V4_PORTPARAMS_RECORDS), "" },
-    { "v4-captive-portal", DHO_V4_CAPTIVE_PORTAL, DHCP4_OPTION_SPACE,
-      OPT_STRING_TYPE, false, NO_RECORD_DEF, "" },
     { "option-6rd", DHO_6RD, DHCP4_OPTION_SPACE, OPT_RECORD_TYPE, true,
       RECORD_DEF(OPT_6RD_RECORDS), "" },
     { "v4-access-domain", DHO_V4_ACCESS_DOMAIN, DHCP4_OPTION_SPACE,
diff --git a/src/lib/dhcp/tests/libdhcp++_unittest.cc b/src/lib/dhcp/tests/libdhcp++_unittest.cc
index b525533496..ab8fa7e8bb 100644
--- a/src/lib/dhcp/tests/libdhcp++_unittest.cc
+++ b/src/lib/dhcp/tests/libdhcp++_unittest.cc
@@ -1659,7 +1659,10 @@ TEST_F(LibDhcpTest, stdOptionDefs4) {
     LibDhcpTest::testStdOptionDefs4(DHO_NETINFO_TAG, begin, end,
                                     typeid(OptionString));
 
-    LibDhcpTest::testStdOptionDefs4(DHO_URL, begin, end,
+    /* Option 114 URL (RFC 3679) was retired and replaced with CAPTIVE_PORTAL (RFC8910)
+       which was previously 160, but was reassigned (compare RFC7710 and RFC8910) */
+
+    LibDhcpTest::testStdOptionDefs4(DHO_V4_CAPTIVE_PORTAL, begin, end,
                                     typeid(OptionString));
 
     LibDhcpTest::testStdOptionDefs4(DHO_DOMAIN_SEARCH, fqdn_buf.begin(),
@@ -1727,9 +1730,6 @@ TEST_F(LibDhcpTest, stdOptionDefs4) {
     LibDhcpTest::testStdOptionDefs4(DHO_V4_PORTPARAMS, begin, begin + 4,
                                     typeid(OptionCustom));
 
-    LibDhcpTest::testStdOptionDefs4(DHO_V4_CAPTIVE_PORTAL, begin, end,
-                                    typeid(OptionString));
-
     LibDhcpTest::testStdOptionDefs4(DHO_6RD, begin, begin + 22,
                                     typeid(OptionCustom));