diff --git a/platformio.ini b/platformio.ini
index 9ce4a60b..a5fffdc1 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1122,7 +1122,9 @@ build_flags = ${esp32_4MB_M_base.build_flags}
 [env:esp32_4MB_eth_M]
 extends = esp32_4MB_M_base
 build_flags = ${esp32_4MB_M_base.build_flags}
-  -D WLED_RELEASE_NAME=esp32_4MB_eth_M -D WLED_USE_ETHERNET
+  -D WLED_RELEASE_NAME=esp32_4MB_eth_M
+  -D WLED_USE_ETHERNET
+  -D RLYPIN=-1 -D BTNPIN=-1 ;; Prevent clash
   -D WLED_DISABLE_ESPNOW ;; ESP-NOW requires wifi, may crash with ethernet only