diff --git a/snmpd-oid-daemon.sh b/snmpd-oid-daemon.sh
index 0788699..0c66b1d 100755
--- a/snmpd-oid-daemon.sh
+++ b/snmpd-oid-daemon.sh
@@ -408,7 +408,7 @@ function update_oid_cache() {
         break
       ;;
       *)
-        echo "cache: received invalid line" >&2
+        echo "cache: received invalid line: $line" >&2
       ;;
     esac
   done