diff --git a/keyboards/linworks/whale75/rules.mk b/keyboards/linworks/whale75/rules.mk
index a9f986d47..444459918 100644
--- a/keyboards/linworks/whale75/rules.mk
+++ b/keyboards/linworks/whale75/rules.mk
@@ -1,5 +1,6 @@
 # MCU name
 MCU = STM32F303
+BOARD = QMK_PROTON_C
 
 # Build Options
 #   change yes to no to disable