diff --git a/configure.ac b/configure.ac
index 6a0c78e4..c6ec7d8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,7 @@ AM_CONDITIONAL(VOICE_MTA_SUPPORT, test x"$voice_support" = x"yes")
 # Check ra_monitor_support
 AM_CONDITIONAL([RA_MONITOR_SUPPORT], [test "$RA_MONITOR_SUPPORT" = "yes"])
 
+AM_CONDITIONAL([ONESTACK_PRODUCT_REQ], [test "x$ONESTACK_PRODUCT_REQ" = "xtrue"])
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h unistd.h])
 
diff --git a/source/DHCPMgrUtils/dhcpmgr_v6_lease_handler.c b/source/DHCPMgrUtils/dhcpmgr_v6_lease_handler.c
index 6835893c..b92eb3c3 100644
--- a/source/DHCPMgrUtils/dhcpmgr_v6_lease_handler.c
+++ b/source/DHCPMgrUtils/dhcpmgr_v6_lease_handler.c
@@ -25,7 +25,10 @@
 #include "dhcpmgr_recovery_handler.h"
 #include "dhcpmgr_custom_options.h"
 #include "ifl.h"
-
+#if defined(_ONESTACK_PRODUCT_REQ_)
+#define COSA_DML_PREF_DELEGATION_SYSEVENT_NAME          "ipv6_prefix_delegation"
+#define COSA_DML_WANIface_PREF_DELEGATION_SYSEVENT_NAME "ipv6_%s_prefix_delegation"
+#endif
 #define COSA_DML_WANIface_PREF_SYSEVENT_NAME           "tr_%s_dhcpv6_client_v6pref"
 #define COSA_DML_WANIface_PREF_IAID_SYSEVENT_NAME      "tr_%s_dhcpv6_client_pref_iaid"
 #define COSA_DML_WANIface_PREF_T1_SYSEVENT_NAME        "tr_%s_dhcpv6_client_pref_t1"
@@ -287,6 +290,10 @@ static void ConfigureIpv6Sysevents(PCOSA_DML_DHCPCV6_FULL pDhcp6c)
 
         IPv6Events eventv6[] = {
         {ia_pd_prefix, COSA_DML_WANIface_PREF_SYSEVENT_NAME},
+#if defined(_ONESTACK_PRODUCT_REQ_)
+	{ia_pd_prefix, COSA_DML_PREF_DELEGATION_SYSEVENT_NAME},
+	{ia_pd_prefix, COSA_DML_WANIface_PREF_DELEGATION_SYSEVENT_NAME},
+#endif
         {iapd_iaid, COSA_DML_WANIface_PREF_IAID_SYSEVENT_NAME},
         {iapd_t1,   COSA_DML_WANIface_PREF_T1_SYSEVENT_NAME},
         {iapd_t2,   COSA_DML_WANIface_PREF_T2_SYSEVENT_NAME},