diff --git a/platformio.ini b/platformio.ini
index 6b8bde1..e068d79 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1,4 +1,8 @@
 ; PlatformIO Project Configuration File https://docs.platformio.org/page/projectconf.html
+
+[platformio]
+default_envs = STM32F103C8
+
 [env]
 framework = arduino
 lib_deps =