diff --git a/tap/source/tcp_packet_source.go b/tap/source/tcp_packet_source.go
index b27ec6175..fa993e724 100644
--- a/tap/source/tcp_packet_source.go
+++ b/tap/source/tcp_packet_source.go
@@ -76,7 +76,7 @@ func newTcpPacketSource(name, filename string, interfaceName string,
 		logger.Log.Infof("Using AF_PACKET socket as the capture source")
 	}
 
-	decoder := gopacket.DecodersByLayerName[string(layers.LinkTypeEthernet)]
+	decoder := gopacket.DecodersByLayerName[layers.LinkTypeEthernet.String()]
 	result.Handle.SetDecoder(decoder, behaviour.Lazy, true)
 
 	if behaviour.BpfFilter != "" {