diff --git a/ArtnetETH.h b/ArtnetETH.h
index 9330ba6..30c8446 100644
--- a/ArtnetETH.h
+++ b/ArtnetETH.h
@@ -41,25 +41,25 @@ struct MacAddress<ETHClass>
 };
 
 template <>
-IPAddress getLocalIP<ETHUdp>()
+inline IPAddress getLocalIP<ETHUdp>()
 {
     return LocalIP<ETHClass>::get(ETH);
 }
 
 template <>
-IPAddress getSubnetMask<ETHUdp>()
+inline IPAddress getSubnetMask<ETHUdp>()
 {
     return SubnetMask<ETHClass>::get(ETH);
 }
 
 template <>
-void getMacAddress<ETHUdp>(uint8_t mac[6])
+inline void getMacAddress<ETHUdp>(uint8_t mac[6])
 {
     MacAddress<ETHClass>::get(ETH, mac);
 }
 
 template <>
-bool isNetworkReady<ETHUdp>()
+inline bool isNetworkReady<ETHUdp>()
 {
     return true;
 }
diff --git a/ArtnetEther.h b/ArtnetEther.h
index 1c0eca6..e2012e6 100644
--- a/ArtnetEther.h
+++ b/ArtnetEther.h
@@ -40,25 +40,25 @@ struct MacAddress<EthernetClass>
 };
 
 template <>
-IPAddress getLocalIP<EthernetUDP>()
+inline IPAddress getLocalIP<EthernetUDP>()
 {
     return LocalIP<EthernetClass>::get(Ethernet);
 }
 
 template <>
-IPAddress getSubnetMask<EthernetUDP>()
+inline IPAddress getSubnetMask<EthernetUDP>()
 {
     return SubnetMask<EthernetClass>::get(Ethernet);
 }
 
 template <>
-void getMacAddress<EthernetUDP>(uint8_t mac[6])
+inline void getMacAddress<EthernetUDP>(uint8_t mac[6])
 {
     MacAddress<EthernetClass>::get(Ethernet, mac);
 }
 
 template <>
-bool isNetworkReady<EthernetUDP>()
+inline bool isNetworkReady<EthernetUDP>()
 {
     return true;
 }
diff --git a/ArtnetEtherENC.h b/ArtnetEtherENC.h
index aec6370..2b0fefa 100644
--- a/ArtnetEtherENC.h
+++ b/ArtnetEtherENC.h
@@ -40,25 +40,25 @@ struct MacAddress<UIPEthernetClass>
 };
 
 template <>
-IPAddress getLocalIP<EthernetUDP>()
+inline IPAddress getLocalIP<EthernetUDP>()
 {
     return LocalIP<UIPEthernetClass>::get(Ethernet);
 }
 
 template <>
-IPAddress getSubnetMask<EthernetUDP>()
+inline IPAddress getSubnetMask<EthernetUDP>()
 {
     return SubnetMask<UIPEthernetClass>::get(Ethernet);
 }
 
 template <>
-void getMacAddress<EthernetUDP>(uint8_t mac[6])
+inline void getMacAddress<EthernetUDP>(uint8_t mac[6])
 {
     MacAddress<UIPEthernetClass>::get(Ethernet, mac);
 }
 
 template <>
-bool isNetworkReady<EthernetUDP>()
+inline bool isNetworkReady<EthernetUDP>()
 {
     return true;
 }
diff --git a/ArtnetNativeEther.h b/ArtnetNativeEther.h
index 9b95de8..cd2f2ae 100644
--- a/ArtnetNativeEther.h
+++ b/ArtnetNativeEther.h
@@ -40,25 +40,25 @@ struct MacAddress<EthernetClass>
 };
 
 template <>
-IPAddress getLocalIP<EthernetUDP>()
+inline IPAddress getLocalIP<EthernetUDP>()
 {
     return LocalIP<EthernetClass>::get(Ethernet);
 }
 
 template <>
-IPAddress getSubnetMask<EthernetUDP>()
+inline IPAddress getSubnetMask<EthernetUDP>()
 {
     return SubnetMask<EthernetClass>::get(Ethernet);
 }
 
 template <>
-void getMacAddress<EthernetUDP>(uint8_t mac[6])
+inline void getMacAddress<EthernetUDP>(uint8_t mac[6])
 {
     MacAddress<EthernetClass>::get(Ethernet, mac);
 }
 
 template <>
-bool isNetworkReady<EthernetUDP>()
+inline bool isNetworkReady<EthernetUDP>()
 {
     return true;
 }
diff --git a/ArtnetWiFi.h b/ArtnetWiFi.h
index bd48194..681d1e3 100644
--- a/ArtnetWiFi.h
+++ b/ArtnetWiFi.h
@@ -99,25 +99,25 @@ struct IsNetworkReady<ArtnetWiFiClass>
 };
 
 template <>
-IPAddress getLocalIP<WiFiUDP>()
+inline IPAddress getLocalIP<WiFiUDP>()
 {
     return LocalIP<ArtnetWiFiClass>::get(WiFi);
 }
 
 template <>
-IPAddress getSubnetMask<WiFiUDP>()
+inline IPAddress getSubnetMask<WiFiUDP>()
 {
     return SubnetMask<ArtnetWiFiClass>::get(WiFi);
 }
 
 template <>
-void getMacAddress<WiFiUDP>(uint8_t mac[6])
+inline void getMacAddress<WiFiUDP>(uint8_t mac[6])
 {
     MacAddress<ArtnetWiFiClass>::get(WiFi, mac);
 }
 
 template <>
-bool isNetworkReady<WiFiUDP>()
+inline bool isNetworkReady<WiFiUDP>()
 {
     return IsNetworkReady<ArtnetWiFiClass>::get(WiFi);
 }