diff --git a/samples/subsys/mgmt/mcumgr/smp_svr/overlay-udp.conf b/samples/subsys/mgmt/mcumgr/smp_svr/overlay-udp.conf
index 20ef2fedb58aa..b2e7875a67e70 100644
--- a/samples/subsys/mgmt/mcumgr/smp_svr/overlay-udp.conf
+++ b/samples/subsys/mgmt/mcumgr/smp_svr/overlay-udp.conf
@@ -11,5 +11,6 @@ CONFIG_NET_IPV6=y
 CONFIG_NET_SOCKETS=y
 CONFIG_NET_CONNECTION_MANAGER=y
 CONFIG_NET_CONFIG_SETTINGS=y
+CONFIG_TEST_RANDOM_GENERATOR=y
 CONFIG_NET_CONFIG_MY_IPV4_ADDR="192.168.1.1"
 CONFIG_NET_CONFIG_MY_IPV6_ADDR="2001:db8::1"