diff --git a/platformio.ini b/platformio.ini
index cdd096875..611ffbb11 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -99,7 +99,7 @@ build_flags                 = ${esp_defaults.build_flags}
                               ; NONOSDK22x_190703 = 2.2.2-dev(38a443e)
                               -DPIO_FRAMEWORK_ARDUINO_ESPRESSIF_SDK22x_190703
                               -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH_LOW_FLASH
-                              ; -DPIO_FRAMEWORK_ARDUINO_LWIP2_IPV6_HIGHER_BANDWIDTH ; enables IPv6
+                              ; -DPIO_FRAMEWORK_ARDUINO_LWIP2_IPV6_HIGHER_BANDWIDTH -DUSE_IPV6 ; enables IPv6
                               ; VTABLES in Flash
                               -DVTABLES_IN_FLASH
                               ; remove the 4-bytes alignment for PSTR()