diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51c7871d..03386c43 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,6 @@ set(LOG_LEVEL ARDUHAL_LOG_LEVEL_NONE)
 add_compile_definitions(TLS_CA_MAX_SIZE=2200)
 add_compile_definitions(TLS_CERT_MAX_SIZE=1500)
 add_compile_definitions(TLS_KEY_MAX_SIZE=1800)
-add_compile_definitions(TX_PAYLOAD_BUFFER_SIZE=6144)
 add_compile_definitions(ESP_PLATFORM)
 add_compile_definitions(ESP32)
 add_compile_definitions(ARDUINO_ARCH_ESP32)