diff --git a/ArduSub/Sub.h b/ArduSub/Sub.h
index 5c17b31fd9..207456c698 100644
--- a/ArduSub/Sub.h
+++ b/ArduSub/Sub.h
@@ -204,7 +204,7 @@ private:
             uint8_t at_bottom           : 1; // true if we are at the bottom
             uint8_t at_surface          : 1; // true if we are at the surface
             uint8_t depth_sensor_present: 1; // true if there is a depth sensor detected at boot
-            uint8_t compass_init_location:1; // true when the compass's initial location has been set
+            uint8_t unused1:1; // was compass_init_location; true when the compass's initial location has been set
         };
         uint32_t value;
     } ap;