diff --git a/check_dns.sh b/check_dns.sh
index fcf2fa6..ee7ab51 100755
--- a/check_dns.sh
+++ b/check_dns.sh
@@ -42,7 +42,7 @@ response_time=$((end_time - start_time))
 perfdata="response_time=${response_time}ms;${warning_time};${critical_time};0;"
 
 # Check response time against warning and critical levels
-if [ -z "$result" ] || echo "$result" | grep -q "no servers could be reached"; then
+if [ -z "$result" ] || echo "$result" | grep -Eq "(no servers could be reached|communications error)"; then
   echo "CRITICAL - DNS resolution failed for $query_domain on $dns_server | $perfdata"
   exit 2
 elif [ "$critical_time" -gt 0 ] && [ "$response_time" -gt "$critical_time" ]; then