diff --git a/src/blackmisc/aviation/altitude.cpp b/src/blackmisc/aviation/altitude.cpp
index 4250186ca..248dd99c9 100644
--- a/src/blackmisc/aviation/altitude.cpp
+++ b/src/blackmisc/aviation/altitude.cpp
@@ -118,6 +118,12 @@ namespace BlackMisc
             }
         }
 
+        int CAltitude::comparePropertyByIndex(const CPropertyIndex &index, const CAltitude &compareValue) const
+        {
+            if (index.isMyself()) { return this->compare(compareValue); }
+            return CLength::comparePropertyByIndex(index, compareValue);
+        }
+
         bool CAltitude::toFlightLevel()
         {
             if (m_datum != MeanSeaLevel && m_datum != FlightLevel) { return false; }
diff --git a/src/blackmisc/aviation/altitude.h b/src/blackmisc/aviation/altitude.h
index e2f84f961..6dc7ba901 100644
--- a/src/blackmisc/aviation/altitude.h
+++ b/src/blackmisc/aviation/altitude.h
@@ -45,7 +45,7 @@ namespace BlackMisc
             public PhysicalQuantities::CLength,
             public Mixin::MetaType<CAltitude>,
             public Mixin::EqualsByMetaClass<CAltitude>,
-            public Mixin::CompareByMetaClass<CAltitude>,
+            // public Mixin::CompareByMetaClass<CAltitude>,
             public Mixin::HashByMetaClass<CAltitude>,
             public Mixin::DBusByMetaClass<CAltitude>,
             public Mixin::DBusByMetaClass<CAltitude, LosslessTag>,
@@ -88,9 +88,6 @@ namespace BlackMisc
                 TrueAltitude        //!< Height of the airplane above Mean Sea Level (MSL)
             };
 
-            //! \copydoc BlackMisc::Mixin::String::toQString
-            QString convertToQString(bool i18n = false) const;
-
             //! Default constructor: 0m Altitude MSL
             CAltitude() : CLength(0, PhysicalQuantities::CLengthUnit::m()), m_datum(MeanSeaLevel) {}
 
@@ -197,6 +194,12 @@ namespace BlackMisc
             //! \copydoc PhysicalQuantities::CPhysicalQuantity::compare
             int compare(const CAltitude &otherAltitude) const;
 
+            //! \copydoc BlackMisc::Mixin::String::toQString
+            QString convertToQString(bool i18n = false) const;
+
+            //! \copydoc Mixin::Index::setPropertyByIndex
+            int comparePropertyByIndex(const CPropertyIndex &index, const CAltitude &compareValue) const;
+
             //! Round to the nearest 100ft, like needed for China and Russia
             //! \remark https://en.wikipedia.org/wiki/Flight_level
             CAltitude roundedToNearest100ft(bool roundDown) const;