diff --git a/library/OneWireSlave/LowLevel.h b/library/OneWireSlave/LowLevel.h
index 35c6d2e..8a0357d 100644
--- a/library/OneWireSlave/LowLevel.h
+++ b/library/OneWireSlave/LowLevel.h
@@ -119,8 +119,8 @@ __attribute__((always_inline)) static inline void UserTimer_Run(short skipTicks)
 class Pin
 {
 private:
-	volatile IO_REG_TYPE *reg_;
 	IO_REG_TYPE mask_;
+	volatile IO_REG_TYPE *reg_;
 	byte interruptNumber_;
 	byte pinNumber_;