diff --git a/libraries/AC_Fence/AC_Fence.cpp b/libraries/AC_Fence/AC_Fence.cpp
index e28ad0b6e23964..f3b0d25a6ab79b 100644
--- a/libraries/AC_Fence/AC_Fence.cpp
+++ b/libraries/AC_Fence/AC_Fence.cpp
@@ -344,6 +344,8 @@ uint8_t AC_Fence::get_auto_disable_fences(void) const
             auto_disable = _auto_enable_mask & AC_FENCE_TYPE_ALT_MIN;
             break;
         default:
+            // when auto disable is not set we still need to disable the altmin fence on landing
+            auto_disable = AC_FENCE_TYPE_ALT_MIN;
             break;
     }
     return auto_disable;