diff --git a/src/NetworkSettings.cpp b/src/NetworkSettings.cpp
index 93c59fe..cde067f 100644
--- a/src/NetworkSettings.cpp
+++ b/src/NetworkSettings.cpp
@@ -251,7 +251,7 @@ void NetworkSettingsClass::setHostname()
     }
 #ifdef OPENDTU_ETHERNET
     else if (_networkMode == network_mode::Ethernet) {
-        if (ETH.setHostname(getHostname())) {
+        if (ETH.setHostname(getHostname().c_str())) {
             Serial.println(F("done"));
         } else {
             Serial.println(F("failed"));