diff --git a/conf/machine/raspberrypi0.conf b/conf/machine/raspberrypi0.conf
index 7c2b811..3bd9e95 100644
--- a/conf/machine/raspberrypi0.conf
+++ b/conf/machine/raspberrypi0.conf
@@ -5,5 +5,5 @@
 MACHINEOVERRIDES = "raspberrypi:${MACHINE}"
 include conf/machine/raspberrypi.conf
 
-SERIAL_CONSOLE = "115200 ttyAMA0"
+SERIAL_CONSOLE ?= "115200 ttyAMA0"
 VC4_CMA_SIZE ?= "cma-128"