diff --git a/libraries/AP_HAL/AP_HAL_Boards.h b/libraries/AP_HAL/AP_HAL_Boards.h
index 0265d43184..ddfc1e8141 100644
--- a/libraries/AP_HAL/AP_HAL_Boards.h
+++ b/libraries/AP_HAL/AP_HAL_Boards.h
@@ -162,3 +162,8 @@
 #ifndef HAL_RANGEFINDER_LIGHTWARE_I2C_BUS
 #define HAL_RANGEFINDER_LIGHTWARE_I2C_BUS 1
 #endif
+
+#ifndef HAL_COMPASS_HMC5843_I2C_ADDR
+#define HAL_COMPASS_HMC5843_I2C_ADDR 0x1E
+#endif
+