diff --git a/main/network/ChangeLog b/main/network/ChangeLog
index 1092b0fa76d..bdc7ee2d2f3 100644
--- a/main/network/ChangeLog
+++ b/main/network/ChangeLog
@@ -1,3 +1,6 @@
+HEAD
+	+ Guard against previous version of squid without
+	  authenticationMode method
 3.0.4
 	+ Improve addition of localhost as primary resolver when DNS module is
 	  enabled.
diff --git a/main/network/src/EBox/Model/DNSResolver.pm b/main/network/src/EBox/Model/DNSResolver.pm
index 814f6b7bab0..091d75e4392 100644
--- a/main/network/src/EBox/Model/DNSResolver.pm
+++ b/main/network/src/EBox/Model/DNSResolver.pm
@@ -150,7 +150,7 @@ sub syncRows
     # as primary resolver instead localhost
     if (EBox::Global->modExists('squid')) {
         my $squid = EBox::Global->modInstance('squid');
-        if ($squid->isEnabled()) {
+        if ($squid->isEnabled() and $squid->can('authenticationMode')) {
             my $mode = $squid->authenticationMode();
             if ($mode eq $squid->AUTH_MODE_EXTERNAL_AD()) {
                 $add = 0;