diff --git a/include/boost/geometry/strategies/spherical/distance_cross_track.hpp b/include/boost/geometry/strategies/spherical/distance_cross_track.hpp
index 31993e76c..31b59e77f 100644
--- a/include/boost/geometry/strategies/spherical/distance_cross_track.hpp
+++ b/include/boost/geometry/strategies/spherical/distance_cross_track.hpp
@@ -340,6 +340,8 @@ public :
           >
     {};
 
+    typedef typename Strategy::radius_type radius_type;
+
     inline cross_track()
     {}
 
@@ -492,6 +494,8 @@ public :
           >
     {};
 
+    typedef typename Strategy::radius_type radius_type;
+
     inline cross_track()
     {}