diff --git a/hardware/esp8266com/esp8266/boards.txt b/hardware/esp8266com/esp8266/boards.txt
index 2d65d7e60..d90802e6d 100644
--- a/hardware/esp8266com/esp8266/boards.txt
+++ b/hardware/esp8266com/esp8266/boards.txt
@@ -324,7 +324,7 @@ esp210.name=SweetPea ESP-210
 esp210.upload.tool=esptool
 esp210.upload.speed=115200
 esp210.upload.resetmethod=ck
-esp210.upload.maximum_size=4194304
+esp210.upload.maximum_size=1044464
 esp210.upload.wait_for_upload_port=true
 esp210.serial.disableDTR=true
 esp210.serial.disableRTS=true