diff --git a/include/sta/ConcreteLibrary.hh b/include/sta/ConcreteLibrary.hh
index 75018056..6d291700 100644
--- a/include/sta/ConcreteLibrary.hh
+++ b/include/sta/ConcreteLibrary.hh
@@ -81,12 +81,12 @@ protected:
   void removeCell(ConcreteCell *cell);
 
   std::string name_;
-  ObjectId id_;
   std::string filename_;
+  ConcreteCellMap cell_map_;
+  ObjectId id_;
   bool is_liberty_;
   char bus_brkt_left_{'['};
   char bus_brkt_right_{']'};
-  ConcreteCellMap cell_map_;
 
 private:
   friend class ConcreteCell;
diff --git a/include/sta/ConcreteNetwork.hh b/include/sta/ConcreteNetwork.hh
index 593c444c..cbbce614 100644
--- a/include/sta/ConcreteNetwork.hh
+++ b/include/sta/ConcreteNetwork.hh
@@ -366,10 +366,10 @@ protected:
   ConcretePort *port_;
   ConcreteNet *net_;
   ConcreteTerm *term_{nullptr};
-  ObjectId id_;
   // Doubly linked list of net pins.
   ConcretePin *net_next_{nullptr};
   ConcretePin *net_prev_{nullptr};
+  ObjectId id_;
   VertexId vertex_id_{vertex_id_null};
 
 private:
diff --git a/network/ConcreteLibrary.cc b/network/ConcreteLibrary.cc
index 77b335a1..45eff5b6 100644
--- a/network/ConcreteLibrary.cc
+++ b/network/ConcreteLibrary.cc
@@ -42,8 +42,8 @@ ConcreteLibrary::ConcreteLibrary(std::string_view name,
                                  std::string_view filename,
                                  bool is_liberty) :
   name_(name),
-  id_(ConcreteNetwork::nextObjectId()),
   filename_(filename),
+  id_(ConcreteNetwork::nextObjectId()),
   is_liberty_(is_liberty)
 {
 }