diff --git a/src/Terrain/TerrainQuery.cc b/src/Terrain/TerrainQuery.cc
index 613b30a5c0fabeaafcc3fda16c98a4b75a220d0f..7ed3105db189abf7a58474d31def3782f40c35ef 100644
--- a/src/Terrain/TerrainQuery.cc
+++ b/src/Terrain/TerrainQuery.cc
@@ -813,7 +813,7 @@ const UnitTestTerrainQuery::Flat10Region UnitTestTerrainQuery::flat10Region{{
           pointNemo.longitude() + UnitTestTerrainQuery::regionExtentDeg
       }
 }};
-const double UnitTestTerrainQuery::Flat10Region::elevationMts;
+const double UnitTestTerrainQuery::Flat10Region::elevationMts = 10;
 
 const UnitTestTerrainQuery::LinearSlopeRegion UnitTestTerrainQuery::linearSlopeRegion{{
     flat10Region.topRight(),
@@ -822,9 +822,9 @@ const UnitTestTerrainQuery::LinearSlopeRegion UnitTestTerrainQuery::linearSlopeR
         flat10Region.topRight().longitude() + UnitTestTerrainQuery::regionExtentDeg
     }
 }};
-const double UnitTestTerrainQuery::LinearSlopeRegion::minElevationMts;
-const double UnitTestTerrainQuery::LinearSlopeRegion::maxElevationMts;
-const double UnitTestTerrainQuery::LinearSlopeRegion::dElevationMts;
+const double UnitTestTerrainQuery::LinearSlopeRegion::minElevationMts = -100;
+const double UnitTestTerrainQuery::LinearSlopeRegion::maxElevationMts = 1000;
+const double UnitTestTerrainQuery::LinearSlopeRegion::dElevationMts   = maxElevationMts-minElevationMts;
 
 UnitTestTerrainQuery::UnitTestTerrainQuery(TerrainQueryInterface* parent)
 :TerrainQueryInterface(parent)
diff --git a/src/Terrain/TerrainQuery.h b/src/Terrain/TerrainQuery.h
index 1bb350a19d2f8f2aa870dc3300c3de399fd160e1..c9da0af0c0fbfe1636143d60e8c17b4088693e5c 100644
--- a/src/Terrain/TerrainQuery.h
+++ b/src/Terrain/TerrainQuery.h
@@ -319,7 +319,7 @@ public:
         :QGeoRectangle(region)
         {}
 
-        static constexpr double elevationMts = 10;
+        static const double elevationMts;
     };
     static const Flat10Region flat10Region;
 
@@ -331,9 +331,9 @@ public:
         :QGeoRectangle(region)
         {}
 
-        static constexpr double minElevationMts = -100;
-        static constexpr double maxElevationMts = 1000;
-        static constexpr double dElevationMts = maxElevationMts-minElevationMts;
+        static const double minElevationMts;
+        static const double maxElevationMts;
+        static const double dElevationMts;
     };
     static const LinearSlopeRegion linearSlopeRegion;