diff --git a/aosp_trout_common.mk b/aosp_trout_common.mk
index add29be..766d89b 100644
--- a/aosp_trout_common.mk
+++ b/aosp_trout_common.mk
@@ -59,6 +59,9 @@
 # Audio Control HAL
 LOCAL_AUDIOCONTROL_HAL_PRODUCT_PACKAGE ?= android.hardware.automotive.audiocontrol-service.trout
 
+# VirtWiFi interface settings
+DEVICE_VIRTWIFI_PORT ?= eth0
+
 # Dumpstate HAL
 # TODO(b/215200137): Re-enable once converted to AIDL
 #LOCAL_DUMPSTATE_PRODUCT_PACKAGE ?= android.hardware.dumpstate@1.1-service.trout