diff --git a/platformio.ini b/platformio.ini
index bf023691..f90bd88a 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -14,7 +14,7 @@ build_dir   = .pioenvs
 lib_dir     = libraries
 libdeps_dir = .piolibdeps
 data_dir = esp3d/data
-default_envs = esp32dev
+default_envs = esp8266
 
 [env:esp32dev]
 platform = https://github.com/platformio/platform-espressif32.git
@@ -37,6 +37,7 @@ lib_ignore =
 [env:esp8266]
 ;esp8266 core 2.5.2
 platform = espressif8266@2.2.0
+platform_packages      = toolchain-xtensa@2.40802.200502
 board = esp12e
 framework = arduino
 monitor_speed = 115200