diff --git a/platformio.ini b/platformio.ini
index a04c86e..f361731 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -65,7 +65,6 @@ platform = ststm32
 board = genericSTM32F103C8
 board_build.mcu = stm32f103c8t6
 board_build.core = maple
-board_build.f_cpu = 128000000L
 framework = arduino
 lib_deps =
     greiman/SdFat @ ^2.0.6