diff --git a/boards/esp32_4M.json b/boards/esp32_4M.json
index c2704e19c..d4b4e90b7 100644
--- a/boards/esp32_4M.json
+++ b/boards/esp32_4M.json
@@ -5,7 +5,7 @@
       "memory_type": "dio_qspi"
     },
     "core": "esp32",
-    "extra_flags": "-DARDUINO_ESP32_DEV -DBOARD_HAS_PSRAM -DARDUINO_USB_CDC_ON_BOOT=0 -DESP32_4M -DESP32_CLASSIC",
+    "extra_flags": "-DARDUINO_ESP32_DEV -DARDUINO_USB_CDC_ON_BOOT=0 -DESP32_4M -DESP32_CLASSIC",
     "f_cpu": "240000000L",
     "f_flash": "40000000L",
     "flash_mode": "dio",