diff --git a/indexer/indexer_tool/world_map_generator.hpp b/indexer/indexer_tool/world_map_generator.hpp
index fefd0815ea..295a9fa92a 100644
--- a/indexer/indexer_tool/world_map_generator.hpp
+++ b/indexer/indexer_tool/world_map_generator.hpp
@@ -23,7 +23,7 @@ namespace m2
 {
   inline size_t hash_value(m2::PointD const & pt)
   {
-    return PointToInt64(pt.x, pt.y);
+    return static_cast<size_t>(PointToInt64(pt.x, pt.y));
   }
 }