--- pcbnew/board_items_to_polygon_shape_transform.cpp.orig	2012-01-26 23:50:21.000000000 +0100
+++ pcbnew/board_items_to_polygon_shape_transform.cpp	2012-01-27 00:50:23.000000000 +0100
@@ -615,8 +615,8 @@
         // The pattern roughtly is a 90 deg arc pie
         std::vector <wxPoint> corners_buffer;
 
-        // Radius of outer arcs of the shape:
-        int outer_radius = dx + aThermalGap;     // The radius of the outer arc is pad radius + aThermalGap
+        // Radius of outer arcs of the shape corrected for arc approximation by lines
+        int outer_radius = (int) ( (dx + aThermalGap) * aCorrectionFactor );
 
         // Crosspoint of thermal spoke sides, the first point of polygon buffer
         corners_buffer.push_back( wxPoint( copper_thickness.x / 2, copper_thickness.y / 2 ) );