diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 395c09c9..721633d8 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -8451,7 +8451,7 @@ sub add_nets_bridge_fdb {
 	my $bridge = $net->{bridge};
 	if ($have_sdn) {
 	    PVE::Network::SDN::Zones::add_bridge_fdb($iface, $mac, $bridge, $net->{firewall});
-	} else {
+	} elsif (-d "/sys/class/net/$bridge/bridge") { # avoid fdb management with OVS for now
 	    PVE::Network::add_bridge_fdb($iface, $mac, $net->{firewall});
 	}
     }
@@ -8470,7 +8470,7 @@ sub del_nets_bridge_fdb {
 	my $bridge = $net->{bridge};
 	if ($have_sdn) {
 	    PVE::Network::SDN::Zones::del_bridge_fdb($iface, $mac, $bridge, $net->{firewall});
-	} else {
+	} elsif (-d "/sys/class/net/$bridge/bridge") { # avoid fdb management with OVS for now
 	    PVE::Network::del_bridge_fdb($iface, $mac, $net->{firewall});
 	}
     }