diff --git a/platformio.ini b/platformio.ini
index 5a4b543..289b9d4 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1,7 +1,7 @@
 ; PlatformIO Project Configuration File https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-default_envs = STM32F103C8
+default_envs = STM32F1
 
 [env]
 framework = arduino