diff --git a/lib/libesp32/ESP32-to-ESP8266-compat/src/ESP8266WiFi.h b/lib/libesp32/ESP32-to-ESP8266-compat/src/ESP8266WiFi.h
index 943b89e9a..94cf3d6c1 100644
--- a/lib/libesp32/ESP32-to-ESP8266-compat/src/ESP8266WiFi.h
+++ b/lib/libesp32/ESP32-to-ESP8266-compat/src/ESP8266WiFi.h
@@ -76,8 +76,8 @@ public:
 
     void scrubDNS(void);
 protected:
-    ip_addr_t dns_save4[DNS_MAX_SERVERS] = {};      // IPv4 DNS servers
 #ifdef USE_IPV6
+    ip_addr_t dns_save4[DNS_MAX_SERVERS] = {};      // IPv4 DNS servers
     ip_addr_t dns_save6[DNS_MAX_SERVERS] = {};      // IPv6 DNS servers
 #endif // USE_IPV6
 };