diff --git a/src/bin/dhcp4/tests/config_parser_unittest.cc b/src/bin/dhcp4/tests/config_parser_unittest.cc
index aa0ebf5d59..b53ce125b2 100644
--- a/src/bin/dhcp4/tests/config_parser_unittest.cc
+++ b/src/bin/dhcp4/tests/config_parser_unittest.cc
@@ -5308,7 +5308,7 @@ TEST_F(Dhcp4ParserTest, hostReservationPerSubnet) {
         " },"
         " {"
         "    \"pools\": [ { \"pool\": \"192.0.3.0/24\" } ],"
-        "    \"subnet\": \"192.0.4.0/24\", "
+        "    \"subnet\": \"192.0.3.0/24\", "
         "    \"reservation-mode\": \"disabled\""
         " },"
         " {"
@@ -5400,7 +5400,7 @@ TEST_F(Dhcp4ParserTest, hostReservationModesPerSubnet) {
         " },"
         " {"
         "    \"pools\": [ { \"pool\": \"192.0.3.0/24\" } ],"
-        "    \"subnet\": \"192.0.4.0/24\", "
+        "    \"subnet\": \"192.0.3.0/24\", "
         "    \"reservation-modes\": {"
         "        \"in-subnet\": false,"
         "        \"out-of-pool\": false,"
diff --git a/src/lib/dhcpsrv/parsers/simple_parser4.cc b/src/lib/dhcpsrv/parsers/simple_parser4.cc
index 36188d973f..79ccf51af1 100644
--- a/src/lib/dhcpsrv/parsers/simple_parser4.cc
+++ b/src/lib/dhcpsrv/parsers/simple_parser4.cc
@@ -70,6 +70,7 @@ const SimpleKeywords SimpleParser4::GLOBAL4_PARAMETERS = {
     { "reservations",                   Element::list },
     { "config-control",                 Element::map },
     { "server-tag",                     Element::string },
+    { "reservation-mode",               Element::string },
     { "reservation-modes",              Element::map },
     { "calculate-tee-times",            Element::boolean },
     { "t1-percent",                     Element::real },
@@ -206,6 +207,7 @@ const SimpleKeywords SimpleParser4::SUBNET4_PARAMETERS = {
     { "client-class",                   Element::string },
     { "require-client-classes",         Element::list },
     { "reservations",                   Element::list },
+    { "reservation-mode",               Element::string, },
     { "reservation-modes",              Element::map, },
     { "relay",                          Element::map },
     { "match-client-id",                Element::boolean },
@@ -323,6 +325,7 @@ const SimpleKeywords SimpleParser4::SHARED_NETWORK4_PARAMETERS = {
     { "server-hostname",                Element::string },
     { "boot-file-name",                 Element::string },
     { "relay",                          Element::map },
+    { "reservation-mode",               Element::string, },
     { "reservation-modes",              Element::map },
     { "client-class",                   Element::string },
     { "require-client-classes",         Element::list },
diff --git a/src/lib/dhcpsrv/parsers/simple_parser6.cc b/src/lib/dhcpsrv/parsers/simple_parser6.cc
index 7a46012742..1e81c6093b 100644
--- a/src/lib/dhcpsrv/parsers/simple_parser6.cc
+++ b/src/lib/dhcpsrv/parsers/simple_parser6.cc
@@ -71,6 +71,7 @@ const SimpleKeywords SimpleParser6::GLOBAL6_PARAMETERS = {
     { "reservations",                   Element::list },
     { "config-control",                 Element::map },
     { "server-tag",                     Element::string },
+    { "reservation-mode",               Element::string, },
     { "reservation-modes",              Element::map },
     { "calculate-tee-times",            Element::boolean },
     { "t1-percent",                     Element::real },
@@ -208,6 +209,7 @@ const SimpleKeywords SimpleParser6::SUBNET6_PARAMETERS = {
     { "client-class",                   Element::string },
     { "require-client-classes",         Element::list },
     { "reservations",                   Element::list },
+    { "reservation-mode",               Element::string, },
     { "reservation-modes",              Element::map },
     { "relay",                          Element::map },
     { "user-context",                   Element::map },
@@ -332,6 +334,7 @@ const SimpleKeywords SimpleParser6::SHARED_NETWORK6_PARAMETERS = {
     { "rebind-timer",                   Element::integer },
     { "option-data",                    Element::list },
     { "relay",                          Element::map },
+    { "reservation-mode",               Element::string, },
     { "reservation-modes",              Element::map },
     { "client-class",                   Element::string },
     { "require-client-classes",         Element::list },