diff --git a/libraries/AP_AHRS/AP_AHRS.cpp b/libraries/AP_AHRS/AP_AHRS.cpp
index c773be6fadb26..945ad67d414b6 100644
--- a/libraries/AP_AHRS/AP_AHRS.cpp
+++ b/libraries/AP_AHRS/AP_AHRS.cpp
@@ -3164,7 +3164,7 @@ bool AP_AHRS::get_variances(float &velVar, float &posVar, float &hgtVar, Vector3
 
 #if AP_AHRS_EXTERNAL_ENABLED
     case EKFType::EXTERNAL:
-        return false;
+        return external.get_variances(velVar, posVar, hgtVar, magVar, tasVar);
 #endif
     }