diff --git a/libraries/WiFi/src/ETH.cpp b/libraries/WiFi/src/ETH.cpp
index 57bace89..00481c2e 100644
--- a/libraries/WiFi/src/ETH.cpp
+++ b/libraries/WiFi/src/ETH.cpp
@@ -129,6 +129,7 @@ bool ETHClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, I
         return false;
     }
     ip_addr_t d;
+    d.type = IPADDR_TYPE_V4;
 
     if(dns1 != (uint32_t)0x00000000) {
         // Set DNS1-Server
diff --git a/libraries/WiFi/src/WiFiSTA.cpp b/libraries/WiFi/src/WiFiSTA.cpp
index 7668eaad..91e62743 100644
--- a/libraries/WiFi/src/WiFiSTA.cpp
+++ b/libraries/WiFi/src/WiFiSTA.cpp
@@ -217,6 +217,7 @@ bool WiFiSTAClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subne
         return false;
     }
     ip_addr_t d;
+    d.type = IPADDR_TYPE_V4;
 
     if(dns1 != (uint32_t)0x00000000) {
         // Set DNS1-Server