diff --git a/boards/ttgo-t-beam.json b/boards/ttgo-t-beam.json
index dccad6f..92d23b5 100644
--- a/boards/ttgo-t-beam.json
+++ b/boards/ttgo-t-beam.json
@@ -1,7 +1,7 @@
 {
   "build": {
     "core": "esp32",
-    "extra_flags": "-DT-Beam",
+    "extra_flags": "-DARDUINO_T-Beam",
     "f_cpu": "240000000L",
     "f_flash": "40000000L",
     "flash_mode": "dio",