diff --git a/libraries/AP_Compass/AP_Compass_AK8963.cpp b/libraries/AP_Compass/AP_Compass_AK8963.cpp
index 094415f5c8..78b1d52073 100644
--- a/libraries/AP_Compass/AP_Compass_AK8963.cpp
+++ b/libraries/AP_Compass/AP_Compass_AK8963.cpp
@@ -258,6 +258,18 @@ void AP_Compass_AK8963::_update()
     // rotate raw_field from sensor frame to body frame
     rotate_field(raw_field, _compass_instance);
 
+#if CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_DISCO
+    /*
+      the disco has a very challenging magnetic environment around the
+      AK8975. The offsets are very large, and prevent calibration
+      completing even with a large fitness. The following brings the
+      values to within range of what the on-board calibrator can
+      handle
+     */
+    raw_field.x -= 350;
+    raw_field.z -= 1800;
+#endif
+    
     // publish raw_field (uncorrected point sample) for calibration use
     publish_raw_field(raw_field, time_us, _compass_instance);