diff --git a/evolve.py b/evolve.py
index 19b1d72f818984f863075dc4b6ef8ab986a03237..7f101b79c764b3c42fb8930e223139c9ade5a274 100644
--- a/evolve.py
+++ b/evolve.py
@@ -37,7 +37,10 @@ if "__main__" == __name__:
         else:
             conf["selection"]["name"] = "tools." + conf["selection"]["name"]
         conf["params"]["selection"] = conf["selection"]
-    
+        
+    if "qd" in conf["algorithm"]["name"]:
+        conf["params"]["mono-objectif"] = True
+     
     if conf["individual"] == "Tree":
         import experiments.gp as evoTool
     elif conf["individual"] == "Linear":
@@ -58,7 +61,6 @@ if "__main__" == __name__:
         from GPRL.containers.grid import FixGrid as Grid
         conf["population"]["args"]["features_domain"] = np.array(conf["population"]["args"]["features_domain"])[conf["params"]["features_kept"]]
         conf["algorithm"]["args"]["container"] = Grid(**conf["population"]["args"])
-        
         if conf["individual"] == "Tree":
             from experiments.qdgp import MC_fitness
         elif conf["individual"] == "Linear":
diff --git a/experiments/gp.py b/experiments/gp.py
index d6ecdc57833056c5f2b4c3c1d5d5df0996efa9ff..487ed2785a03a52e78fa3bbc251310ca626e72a1 100644
--- a/experiments/gp.py
+++ b/experiments/gp.py
@@ -88,8 +88,10 @@ class Factory(EvolveFactory):
             pset.addEphemeralConstant("const_"+str(k), lambda: np.random.uniform(-20.0, 20.0), float)
         pset.addTerminal(True, bool)
         pset.addTerminal(1, int)
-
-        creator.create("FitnessMax", UCBFitness, weights=(1.0, -1.0), c=self.conf["c"], sigma=1)
+        weights = (1.0, -1.0)
+        if self.conf.get("mono-objectif", None):
+            weights = (1.0,)
+        creator.create("FitnessMax", UCBFitness, weights=weights, c=self.conf["c"], sigma=1)
         creator.create("Individual", list, fitness=creator.FitnessMax)
 
         toolbox = base.Toolbox()
diff --git a/experiments/linGP.py b/experiments/linGP.py
index b451ccd81e265bec9d0a24cf30e5849fcb7974fe..9795198f0aee4f45ccdfdb60118e3638b8599dac 100644
--- a/experiments/linGP.py
+++ b/experiments/linGP.py
@@ -78,7 +78,10 @@ class Factory(EvolveFactory):
         toolbox, creator = self.make_toolbox()
     
     def make_toolbox(self):
-        creator.create("FitnessMax", UCBFitness, weights=(1.0, -1.0), c=self.conf["c"], sigma=1)
+        weights = (1.0, -1.0)
+        if self.conf.get("mono-objectif", None):
+            weights = (1.0,)
+        creator.create("FitnessMax", UCBFitness, weights=weights, c=self.conf["c"], sigma=1)
         creator.create("Individual", linGP.Program, fitness=creator.FitnessMax)
 
         if self.conf['function_set']=="small":