diff --git a/arpspoof/rootfs/etc/cont-init.d/99-run.sh b/arpspoof/rootfs/etc/cont-init.d/99-run.sh
index 1e1e35545..e8068f2e0 100644
--- a/arpspoof/rootfs/etc/cont-init.d/99-run.sh
+++ b/arpspoof/rootfs/etc/cont-init.d/99-run.sh
@@ -2,7 +2,7 @@
 
 # Autodefine if not defined
 if [ -n INTERFACE_NAME ]; then
-    export INTERFACE_NAME=$(ip route get 8.8.8.8 | sed -nr 's/.*dev ([^\ ]+).*/\1/p')
+    export INTERFACE_NAME="$(ip route get 8.8.8.8 | sed -nr 's/.*dev ([^\ ]+).*/\1/p')"
     bashio::log.blue "Autodetection : INTERFACE_NAME=$INTERFACE_NAME"
 fi