diff --git a/spot/twaalgos/determinize.cc b/spot/twaalgos/determinize.cc
index 2f5fd9af0..aa61ce8e7 100644
--- a/spot/twaalgos/determinize.cc
+++ b/spot/twaalgos/determinize.cc
@@ -32,7 +32,7 @@
 #include <spot/twaalgos/degen.hh>
 #include <spot/twaalgos/sccfilter.hh>
 #include <spot/twaalgos/simulation.hh>
-#include <spot/twaalgos/complete.hh>
+
 
 namespace spot
 {
@@ -607,9 +607,9 @@ namespace spot
   }
 
   twa_graph_ptr
-  tgba_determinisation(const const_twa_graph_ptr& a, bool bisimulation,
-                       bool pretty_print, bool scc_opt, bool use_bisimulation,
-                       bool complete, bool use_stutter)
+  tgba_determinisation(const const_twa_graph_ptr& a,
+                       bool pretty_print, bool scc_opt,
+		       bool use_bisimulation, bool use_stutter)
   {
     // Degeneralize
     twa_graph_ptr aut = spot::degeneralize_tba(a);
@@ -729,12 +729,8 @@ namespace spot
     res->prop_deterministic(true);
     res->prop_state_acc(false);
 
-    if (bisimulation)
-      res = simulation(res);
     if (pretty_print)
       res->set_named_prop("state-names", print_debug(seen));
-    if (complete)
-      spot::complete_here(res);
     return res;
   }
 }
diff --git a/spot/twaalgos/determinize.hh b/spot/twaalgos/determinize.hh
index 608846cc6..db9234b7b 100644
--- a/spot/twaalgos/determinize.hh
+++ b/spot/twaalgos/determinize.hh
@@ -25,10 +25,8 @@ namespace spot
 {
   SPOT_API twa_graph_ptr
   tgba_determinisation(const const_twa_graph_ptr& aut,
-                       bool bisimulation = false,
                        bool pretty_print = false,
                        bool scc_opt = false,
                        bool use_bisimulation = false,
-                       bool complete = false,
                        bool use_stutter = false);
 }
diff --git a/tests/core/safra.cc b/tests/core/safra.cc
index 2e6adf90e..05fca6157 100644
--- a/tests/core/safra.cc
+++ b/tests/core/safra.cc
@@ -20,15 +20,17 @@
 #include <iostream>
 #include <cstring>
 
-#include "spot/tl/parse.hh" // spot::parse_infix_psl
-#include "spot/tl/formula.hh" // spot::formula
-#include "spot/parseaut/public.hh"
-#include "spot/twa/twagraph.hh"
-#include "spot/twaalgos/degen.hh"
-#include "spot/twaalgos/dot.hh" // print_dot
-#include "spot/twaalgos/hoa.hh" // print_hoa
-#include "spot/twaalgos/determinize.hh"
-#include "spot/twaalgos/translate.hh"
+#include <spot/tl/parse.hh> // spot::parse_infix_psl
+#include <spot/tl/formula.hh> // spot::formula
+#include <spot/parseaut/public.hh>
+#include <spot/twa/twagraph.hh>
+#include <spot/twaalgos/degen.hh>
+#include <spot/twaalgos/dot.hh> // print_dot
+#include <spot/twaalgos/hoa.hh> // print_hoa
+#include <spot/twaalgos/determinize.hh>
+#include <spot/twaalgos/translate.hh>
+#include <spot/twaalgos/complete.hh>
+#include <spot/twaalgos/simulation.hh>
 
 
 int help();
@@ -117,18 +119,23 @@ int main(int argc, char* argv[])
       spot::translator trans(dict);
       trans.set_pref(spot::postprocessor::Deterministic);
       auto tmp = trans.run(f);
-      res = spot::tgba_determinisation(tmp, sim, pretty_print, scc_opt,
-                                       use_bisim, complete, use_stutter);
+      res = spot::tgba_determinisation(tmp, pretty_print, scc_opt,
+                                       use_bisim, use_stutter);
     }
   else if (in_hoa)
     {
       auto aut = spot::parse_aut(input, dict);
       if (aut->format_errors(std::cerr))
         return 2;
-      res = tgba_determinisation(aut->aut, sim, pretty_print, scc_opt,
-                                 use_bisim, complete, use_stutter);
+      res = tgba_determinisation(aut->aut, pretty_print, scc_opt,
+                                 use_bisim, use_stutter);
     }
-  res->merge_edges();
+  if (sim)
+    res = simulation(res);
+  else
+    res->merge_edges();
+  if (complete)
+    spot::complete_here(res);
 
   if (out_hoa)
     {