diff --git a/board-package-source/variants/arduboy-promicro/pins_arduino.h b/board-package-source/variants/arduboy-promicro/pins_arduino.h
index 21588de..8b11e67 100644
--- a/board-package-source/variants/arduboy-promicro/pins_arduino.h
+++ b/board-package-source/variants/arduboy-promicro/pins_arduino.h
@@ -22,6 +22,8 @@
 
 #include "../arduboy-leonardo/pins_arduino.h"
 
+#define OLED_CS 8
+
 #undef LED_BUILTIN
 
 #define LED_BUILTIN 17