diff --git a/boards/esp32-solo1.json b/boards/esp32-solo1.json
index fa59c624b..377f48b72 100644
--- a/boards/esp32-solo1.json
+++ b/boards/esp32-solo1.json
@@ -2,7 +2,7 @@
   "build": {
     "core": "esp32",
     "extra_flags": "-DARDUINO_TASMOTA -DESP32_4M -DCORE32SOLO1",
-    "f_cpu": "240000000L",
+    "f_cpu": "160000000L",
     "f_flash": "40000000L",
     "flash_mode": "dio",
     "mcu": "esp32",