diff --git a/ethernet/arp/arp.go b/ethernet/arp/arp.go
index 0bd7c52..c37e91e 100644
--- a/ethernet/arp/arp.go
+++ b/ethernet/arp/arp.go
@@ -33,14 +33,14 @@ func ProcessARPPacket(packet gopacket.Packet) error {
 	if arppacket.Operation == layers.ARPRequest {
 		// Request packet
 		participant.asked++
-		appendIfUnique(net.IP(arppacket.DstProtAddress).String(), participant.askedList)
+		participant.askedList = appendIfUnique(net.IP(arppacket.DstProtAddress).String(), participant.askedList)
 
 		// Add device entry
 		addDeviceEntry(sourceAddr, net.IP(arppacket.SourceProtAddress).String())
 	} else {
 		// Response packet
 		participant.answered++
-		appendIfUnique(net.IP(arppacket.SourceProtAddress).String(), participant.answeredList)
+		participant.answeredList = appendIfUnique(net.IP(arppacket.SourceProtAddress).String(), participant.answeredList)
 
 		// Add device entry
 		addDeviceEntry(sourceAddr, net.IP(arppacket.SourceProtAddress).String())
diff --git a/ethernet/dhcpv4/dhcp.go b/ethernet/dhcpv4/dhcp.go
index 8093d21..5032b8b 100644
--- a/ethernet/dhcpv4/dhcp.go
+++ b/ethernet/dhcpv4/dhcp.go
@@ -42,7 +42,7 @@ func HandleDHCPv4Packet(packet gopacket.Packet) error {
 	// Examine packet further
 	if dhcppacket.Operation == layers.DHCPOpRequest {
 		// Request packet
-		appendIfUnique(dhcppacket.ClientHWAddr.String(), requestMAC)
+		requestMAC = appendIfUnique(dhcppacket.ClientHWAddr.String(), requestMAC)
 	} else {
 		// Response/Offer packet
 		addResponseEntry(dhcppacket.ClientIP.String(), dhcppacket.YourClientIP.String(), dhcppacket.ClientHWAddr.String(), ethernetpacket.SrcMAC.String())