diff --git a/nix/pkgs/openwrt/usteer-stats.sh b/nix/pkgs/openwrt/usteer-stats.sh
index 1a26c43..6cbd7ce 100755
--- a/nix/pkgs/openwrt/usteer-stats.sh
+++ b/nix/pkgs/openwrt/usteer-stats.sh
@@ -6,6 +6,11 @@ INTERVAL=60
 [ -p /tmp/usteer-info ] || mkfifo /tmp/usteer-info
 
 while true; do
+    if [ ! -p /tmp/usteer-info ]; then
+      echo "/tmp/usteer-info went missing!"
+      exit 1
+    fi
+
     DATA="$(cat /tmp/usteer-info)"
     cd /sys/class/net
     for iface in wlan*; do