diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae3f956bee7..775baecf412 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -174,6 +174,7 @@ set(includedirs
   libraries/EEPROM/src
   libraries/ESP32/src
   libraries/ESPmDNS/src
+  libraries/Ethernet/src
   libraries/FFat/src
   libraries/FS/src
   libraries/HTTPClient/src