diff --git a/samples/net/cloud/aws_iot_mqtt/prj.conf b/samples/net/cloud/aws_iot_mqtt/prj.conf
index 825bd8514b9..2a85e860b5f 100644
--- a/samples/net/cloud/aws_iot_mqtt/prj.conf
+++ b/samples/net/cloud/aws_iot_mqtt/prj.conf
@@ -44,6 +44,8 @@ CONFIG_NET_CONFIG_SNTP_INIT_SERVER="0.pool.ntp.org"
 
 # Logging
 CONFIG_LOG=y
+CONFIG_LOG_TIMESTAMP_USE_REALTIME=y
+CONFIG_POSIX_C_LANG_SUPPORT_R=y
 
 # Network buffers
 CONFIG_NET_PKT_RX_COUNT=32
diff --git a/samples/posix/gettimeofday/prj.conf b/samples/posix/gettimeofday/prj.conf
index 5bc3ed7ec33..58b31d788a9 100644
--- a/samples/posix/gettimeofday/prj.conf
+++ b/samples/posix/gettimeofday/prj.conf
@@ -30,3 +30,7 @@ CONFIG_NET_CONFIG_MY_IPV4_GW="192.0.2.2"
 
 # Network debug config
 CONFIG_NET_LOG=y
+
+# Use realtime for log timestamps
+CONFIG_LOG_TIMESTAMP_USE_REALTIME=y
+CONFIG_POSIX_C_LANG_SUPPORT_R=y