diff --git a/Makefile b/Makefile
index 4e9a03d..69a4a36 100644
--- a/Makefile
+++ b/Makefile
@@ -28,7 +28,7 @@ FIRMWARE = $(APPLICATION) $(BOOTLOADER)
 
 # which development board is used
 # supported are: SYSTEM_BOARD, MAPLE_MINI, BLUE_PILL, CORE_BOARD
-BOARD = SYSTEM_BOARD
+BOARD = CORE_BOARD
 
 # opencm3 libraries
 OPENCM3_DIR := libopencm3