diff --git a/Rakefile b/Rakefile
index ec51220..2afb466 100644
--- a/Rakefile
+++ b/Rakefile
@@ -15,7 +15,7 @@ FIRMWARES = [BOOTLOADER, APPLICATION]
 
 # which development board is used
 # supported are: SYSTEM_BOARD, MAPLE_MINI, BLUE_PILL, CORE_BOARD, STLINKV2, BLASTER, BUSVOODOO
-BOARD = ENV["BOARD"] || "CORE_BOARD"
+BOARD = ENV["BOARD"] || "STLINKV2"
 
 # libopencm3 definitions
 LIBOPENCM3_DIR = "libopencm3"