diff --git a/src/lib/dhcpsrv/parsers/simple_parser4.cc b/src/lib/dhcpsrv/parsers/simple_parser4.cc
index 48d4a3efbd..5095451f95 100644
--- a/src/lib/dhcpsrv/parsers/simple_parser4.cc
+++ b/src/lib/dhcpsrv/parsers/simple_parser4.cc
@@ -70,7 +70,6 @@ const SimpleKeywords SimpleParser4::GLOBAL4_PARAMETERS = {
     { "reservations",                   Element::list },
     { "config-control",                 Element::map },
     { "server-tag",                     Element::string },
-    { "reservation-mode",               Element::string },
     { "reservations-global",            Element::boolean },
     { "reservations-in-subnet",         Element::boolean },
     { "reservations-out-of-pool",       Element::boolean },
diff --git a/src/lib/dhcpsrv/parsers/simple_parser6.cc b/src/lib/dhcpsrv/parsers/simple_parser6.cc
index 7b71508292..e9317d7187 100644
--- a/src/lib/dhcpsrv/parsers/simple_parser6.cc
+++ b/src/lib/dhcpsrv/parsers/simple_parser6.cc
@@ -71,7 +71,6 @@ const SimpleKeywords SimpleParser6::GLOBAL6_PARAMETERS = {
     { "reservations",                   Element::list },
     { "config-control",                 Element::map },
     { "server-tag",                     Element::string },
-    { "reservation-mode",               Element::string },
     { "reservations-global",            Element::boolean },
     { "reservations-in-subnet",         Element::boolean },
     { "reservations-out-of-pool",       Element::boolean },