diff --git a/boards/esp32_16M.json b/boards/esp32_16M.json
index f94e36493..6ebd73c76 100644
--- a/boards/esp32_16M.json
+++ b/boards/esp32_16M.json
@@ -7,7 +7,7 @@
     "extra_flags": "-DARDUINO_ESP32_DEV -DESP32_16M",
     "f_cpu": "80000000L",
     "f_flash": "40000000L",
-    "flash_mode": "dio",
+    "flash_mode": "dout",
     "mcu": "esp32",
     "variant": "esp32",
     "partitions": "esp32_partition_app2944k_spiffs10M.csv"