diff --git a/samples/network/test_15_4/Makefile b/samples/network/test_15_4/Makefile
index 25aaa06e4af..ccc880a1d1c 100644
--- a/samples/network/test_15_4/Makefile
+++ b/samples/network/test_15_4/Makefile
@@ -35,4 +35,8 @@ KERNEL_TYPE = nano
 PLATFORM_CONFIG ?= basic_atom
 CONF_FILE = prj_$(ARCH).conf
 
+ifeq ($(CONFIG_NETWORKING_WITH_15_4_LOOPBACK_UART),y)
+     QEMU_EXTRA_FLAGS += -serial none -serial pipe:/tmp/ip-15-4-${QEMU_NUM} -pidfile qemu-$(QEMU_NUM).pid
+endif
+
 include $(ZEPHYR_BASE)/Makefile.inc
diff --git a/samples/network/test_15_4/prj_arm.conf b/samples/network/test_15_4/prj_arm.conf
index 1599f10052a..b31656bc083 100644
--- a/samples/network/test_15_4/prj_arm.conf
+++ b/samples/network/test_15_4/prj_arm.conf
@@ -4,3 +4,4 @@ CONFIG_NETWORKING_WITH_LOGGING=y
 CONFIG_NETWORKING_WITH_6LOWPAN=y
 CONFIG_NETWORKING_WITH_15_4=y
 CONFIG_NETWORKING_WITH_15_4_LOOPBACK=y
+CONFIG_NETWORKING_WITH_15_4_LOOPBACK_UART=n
diff --git a/samples/network/test_15_4/prj_x86.conf b/samples/network/test_15_4/prj_x86.conf
index 1599f10052a..b31656bc083 100644
--- a/samples/network/test_15_4/prj_x86.conf
+++ b/samples/network/test_15_4/prj_x86.conf
@@ -4,3 +4,4 @@ CONFIG_NETWORKING_WITH_LOGGING=y
 CONFIG_NETWORKING_WITH_6LOWPAN=y
 CONFIG_NETWORKING_WITH_15_4=y
 CONFIG_NETWORKING_WITH_15_4_LOOPBACK=y
+CONFIG_NETWORKING_WITH_15_4_LOOPBACK_UART=n