diff --git a/spot/mc/bloemen.hh b/spot/mc/bloemen.hh
index 615032fbe..d6111d3ef 100644
--- a/spot/mc/bloemen.hh
+++ b/spot/mc/bloemen.hh
@@ -93,7 +93,7 @@ namespace spot
 
     iterable_uf(shared_map& map, unsigned tid):
       map_(map), tid_(tid), size_(std::thread::hardware_concurrency()),
-      nb_th_(std::thread::hardware_concurrency())
+      nb_th_(std::thread::hardware_concurrency()), inserted_(0)
     {
     }
 
@@ -120,6 +120,8 @@ namespace spot
       // FIXME Should we add a local cache to avoid useless allocations?
       if (!b)
         delete v;
+      else
+        ++inserted_;
 
       uf_element* a_root = find(*it);
       if (a_root->uf_status_.load() == uf_status::DEAD)
@@ -376,16 +378,23 @@ namespace spot
         }
     }
 
+    unsigned inserted()
+    {
+      return inserted_;
+    }
+
   private:
     shared_map map_;      ///< \brief Map shared by threads copy!
     unsigned tid_;        ///< \brief The Id of the current thread
     unsigned size_;       ///< \brief Maximum number of thread
     unsigned nb_th_;      ///< \brief Current number of threads
+    unsigned inserted_;   ///< \brief The number of insert succes
   };
 
   /// \brief This object is returned by the algorithm below
   struct SPOT_API bloemen_stats
   {
+    unsigned inserted;          ///< \brief Number of states inserted
     unsigned states;            ///< \brief Number of states visited
     unsigned transitions;       ///< \brief Number of transitions visited
     unsigned sccs;              ///< \brief Number of SCCs visited
@@ -477,7 +486,7 @@ namespace spot
 
     bloemen_stats stats()
     {
-      return {states_, transitions_, sccs_, walltime()};
+      return {uf_.inserted(), states_, transitions_, sccs_, walltime()};
     }
 
   private:
@@ -487,6 +496,7 @@ namespace spot
     iterable_uf<State, StateHash, StateEqual> uf_; ///< Copy!
     unsigned tid_;
     unsigned nb_th_;
+    unsigned inserted_ = 0;           ///< \brief Number of states inserted
     unsigned states_  = 0;            ///< \brief Number of states visited
     unsigned transitions_ = 0;        ///< \brief Number of transitions visited
     unsigned sccs_ = 0;               ///< \brief Number of SCC visited
diff --git a/tests/ltsmin/modelcheck.cc b/tests/ltsmin/modelcheck.cc
index a91950361..97ec168a6 100644
--- a/tests/ltsmin/modelcheck.cc
+++ b/tests/ltsmin/modelcheck.cc
@@ -657,10 +657,12 @@ static int checked_main()
         unsigned sccs = 0;
         unsigned st = 0;
         unsigned tr = 0;
+        unsigned inserted = 0;
         for (unsigned i = 0; i < res.first.size(); ++i)
           {
             std::cout << "\n---- Thread number : " << i << '\n';
             std::cout << res.first[i].states << " unique states visited\n";
+            std::cout << res.first[i].inserted << " unique states inserted\n";
             std::cout << res.first[i].transitions
                       << " transitions explored\n";
             std::cout << res.first[i].sccs << " sccs found\n";
@@ -670,6 +672,7 @@ static int checked_main()
             sccs += res.first[i].sccs;
             st += res.first[i].states;
             tr += res.first[i].transitions;
+            inserted += res.first[i].inserted;
 
             if (mc_options.csv)
               {
@@ -679,6 +682,7 @@ static int checked_main()
                 std::cout << "@th_" << i << ','
                           << res.first[i].walltime << ','
                           << res.first[i].states << ','
+                          << res.first[i].inserted << ','
                           << res.first[i].transitions << ','
                           << res.first[i].sccs
                           << std::endl;
@@ -690,6 +694,7 @@ static int checked_main()
           std::cout << "\nSummary :\n";
           std::cout << "Find following the csv: "
                     << "model,walltimems,memused,"
+                    << "inserted_states,"
                     << "cumulated_states,cumulated_transitions,"
                     << "cumulated_sccs\n";
 
@@ -698,6 +703,7 @@ static int checked_main()
                     << ','
                     << tm.timer("bloemen").walltime() << ','
                     << memused << ','
+                    << inserted << ','
                     << st << ','
                     << tr << ','
                     << sccs