diff --git a/kml/pykmlib/bindings.cpp b/kml/pykmlib/bindings.cpp
index 8d5b84f677..cf77b2c6c0 100644
--- a/kml/pykmlib/bindings.cpp
+++ b/kml/pykmlib/bindings.cpp
@@ -946,11 +946,12 @@ BOOST_PYTHON_MODULE(pykmlib)
     .def_readwrite("bookmarks", &FileData::m_bookmarksData)
     .def_readwrite("tracks", &FileData::m_tracksData)
     .def_readwrite("compilations", &FileData::m_compilationsData)
-    .def("set_bookmarks_min_zoom", &FileData::SetBookmarksMinZoom)
     .def("__eq__", &FileData::operator==)
     .def("__ne__", &FileData::operator!=)
     .def("__str__", &FileDataToString);
 
+  def("set_bookmarks_min_zoom", &SetBookmarksMinZoom);
+
   def("get_supported_languages", GetSupportedLanguages);
   def("get_language_index", GetLanguageIndex);
   def("timestamp_to_int", &ToSecondsSinceEpoch);
diff --git a/kml/pykmlib/bindings_test.py b/kml/pykmlib/bindings_test.py
index d5d676637a..9298de468d 100644
--- a/kml/pykmlib/bindings_test.py
+++ b/kml/pykmlib/bindings_test.py
@@ -109,7 +109,8 @@ class PyKmlibAdsTest(unittest.TestCase):
         file_data.bookmarks.append(bookmark)
         file_data.tracks.append(track)
         file_data.compilations = compilations
-        file_data.set_bookmarks_min_zoom(1.0, 19)
+
+        pykmlib.set_bookmarks_min_zoom(file_data, 1.0, 19)
 
         s = pykmlib.export_kml(file_data)
         imported_file_data = pykmlib.import_kml(s)
diff --git a/kml/types.cpp b/kml/types.cpp
index 15c157daf6..bed680ad44 100644
--- a/kml/types.cpp
+++ b/kml/types.cpp
@@ -8,7 +8,7 @@
 
 namespace kml
 {
-void FileData::SetBookmarksMinZoom(double countPerTile, int maxZoom)
+void SetBookmarksMinZoom(FileData & fileData, double countPerTile, int maxZoom)
 {
   using ValueType = std::pair<BookmarkData *, int /* score */>;
   auto const scoreLess = [](ValueType const & lhs, ValueType const & rhs) -> bool
@@ -16,7 +16,7 @@ void FileData::SetBookmarksMinZoom(double countPerTile, int maxZoom)
     return lhs.second < rhs.second;
   };
   MinZoomQuadtree<ValueType, decltype(scoreLess)> minZoomQuadtree{scoreLess};
-  for (auto & bm : m_bookmarksData)
+  for (auto & bm : fileData.m_bookmarksData)
   {
     auto const & properties = bm.m_properties;
     int score = 0;
diff --git a/kml/types.hpp b/kml/types.hpp
index 6950cb95cd..74ab822f20 100644
--- a/kml/types.hpp
+++ b/kml/types.hpp
@@ -464,8 +464,6 @@ struct FileData
 
   bool operator!=(FileData const & data) const { return !operator==(data); }
 
-  void SetBookmarksMinZoom(double countPerTile, int maxZoom);
-
   // Device id (it will not be serialized in text files).
   std::string m_deviceId;
   // Server id.
@@ -479,6 +477,8 @@ struct FileData
   // Compilation collection.
   std::vector<CategoryData> m_compilationsData;
 };
+
+void SetBookmarksMinZoom(FileData & fileData, double countPerTile, int maxZoom);
   
 inline std::string DebugPrint(BookmarkIcon icon)
 {