diff --git a/configs/dk-tm4c129x/ipv6/defconfig b/configs/dk-tm4c129x/ipv6/defconfig
index d31b78c0f9..7980f0bb38 100644
--- a/configs/dk-tm4c129x/ipv6/defconfig
+++ b/configs/dk-tm4c129x/ipv6/defconfig
@@ -636,7 +636,7 @@ CONFIG_NET_ICMPv6=y
 CONFIG_NET_ICMPv6_PING=y
 CONFIG_NET_ICMPv6_NEIGHBOR=y
 CONFIG_ICMPv6_NEIGHBOR_MAXTRIES=5
-CONFIG_ICMPv6_NEIGHBOR_DELAYMSEC=100
+CONFIG_ICMPv6_NEIGHBOR_DELAYMSEC=20
 
 #
 # IGMPv2 Client Support