diff --git a/tools/pve/monitor-all.sh b/tools/pve/monitor-all.sh
index 650c86a8b..d1084aea4 100644
--- a/tools/pve/monitor-all.sh
+++ b/tools/pve/monitor-all.sh
@@ -110,8 +110,9 @@ while true; do
         pct start "$instance" >/dev/null 2>&1
         continue
       fi
-      # Not every container names its interface eth0.
-      IP=$(pct exec "$instance" -- ip -4 -o addr show scope global 2>/dev/null | awk '{print $4}' | cut -d/ -f1 | head -n1)
+      # Read the IP from the host side; pct exec depends on tools inside the
+      # guest, which minimal/OCI images may lack.
+      IP=$(lxc-info -n "$instance" -iH 2>/dev/null | awk '/^[0-9.]+$/ && !/^(127|169\.254)\./ {print; exit}')
       if [ -z "$IP" ] || ! ping -c 1 -W 2 "$IP" >/dev/null 2>&1; then
         echo "$(date): CT $instance is not responding, restarting..."
         pct stop "$instance" >/dev/null 2>&1