diff --git a/avr/boards.txt b/avr/boards.txt
index 1d6173b..47f0c70 100644
--- a/avr/boards.txt
+++ b/avr/boards.txt
@@ -38,7 +38,7 @@ model01.build.board=AVR_MODEL01
 model01.build.core=arduino:arduino
 model01.build.variant=model01
 # TODO - the hardware spec / hardware duplication here makes Jesse unhappy. he would not like to see it live here long-term
-model01.build.extra_flags={build.usb_flags} '-DKALEIDOSCOPE_HARDWARE_H="Kaleidoscope-Hardware-Model01.h"' '-DKALEIDOSCOPE_HARDWARE_SPEC_H="kaleidoscope/hardware/keyboardio/Model01_Spec.h"'
+model01.build.extra_flags={build.usb_flags} '-DKALEIDOSCOPE_HARDWARE_H="Kaleidoscope-Hardware-Model01.h"'