diff --git a/branches/follower/wiz810mj/src/lib/types.h b/branches/follower/wiz810mj/src/lib/types.h
index 818e564..b9a9181 100644
--- a/branches/follower/wiz810mj/src/lib/types.h
+++ b/branches/follower/wiz810mj/src/lib/types.h
@@ -19,7 +19,7 @@
 // TODO: We should really specify the Chip Select pin based on
 // the MCU rather than the platform.
 #ifdef __ARDUINO__
-#define CS_PIN PB2
+#define CS_PIN (1 << PB2)
 #endif
 
 //---- Refer "Rom File Maker Manual Vx.x.pdf"