diff --git a/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp b/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
index 05a970251..669e426d6 100644
--- a/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
@@ -559,7 +559,8 @@ struct get_turns_cs
                 RobustPolicy const& robust_policy,
                 Turns& turns,
                 InterruptPolicy& interrupt_policy,
-                int multi_index = -1, int ring_index = -1)
+                signed_index_type multi_index = -1,
+                signed_index_type ring_index = -1)
     {
         if ( boost::size(range) <= 1)
         {
@@ -572,7 +573,8 @@ struct get_turns_cs
         cview_type cview(range);
         view_type view(cview);
 
-        typename boost::range_size<view_type>::type segments_count1 = boost::size(view) - 1;
+        typedef typename boost::range_size<view_type>::type size_type;
+        size_type segments_count1 = boost::size(view) - 1;
 
         iterator_type it = boost::begin(view);
 
@@ -585,7 +587,7 @@ struct get_turns_cs
 
         //char previous_side[2] = {0, 0};
 
-        int index = 0;
+        signed_index_type index = 0;
 
         for (iterator_type prev = it++;
             it != boost::end(view);
@@ -624,7 +626,7 @@ struct get_turns_cs
                         bp[0], bp[1], bp[2], bp[3],
                         // NOTE: some dummy values could be passed below since this would be called only for Polygons and Boxes
                         index == 0,
-                        unsigned(index) == segments_count1,
+                        size_type(index) == segments_count1,
                         robust_policy,
                         turns, interrupt_policy);
                 // Future performance enhancement:
@@ -729,7 +731,7 @@ struct get_turns_polygon_cs
             int source_id2, Box const& box,
             RobustPolicy const& robust_policy,
             Turns& turns, InterruptPolicy& interrupt_policy,
-            int multi_index = -1)
+            signed_index_type multi_index = -1)
     {
         typedef typename geometry::ring_type<Polygon>::type ring_type;
 
@@ -747,7 +749,7 @@ struct get_turns_polygon_cs
                 turns, interrupt_policy,
                 multi_index, -1);
 
-        int i = 0;
+        signed_index_type i = 0;
 
         typename interior_return_type<Polygon const>::type
             rings = interior_rings(polygon);
@@ -786,7 +788,7 @@ struct get_turns_multi_polygon_cs
                 Multi const
             >::type iterator_type;
 
-        int i = 0;
+        signed_index_type i = 0;
         for (iterator_type it = boost::begin(multi);
              it != boost::end(multi);
              ++it, ++i)