diff --git a/lsystem.py b/lsystem.py
index 3a69868..75fff41 100644
--- a/lsystem.py
+++ b/lsystem.py
@@ -79,7 +79,7 @@ def genere3(regles, L0, n):
         for j in L:
             regle = regles.get(j, [(1,j)])
             poids_total = sum(map(lambda x:x[0], regle))
-            tirage = rd.uniform(0,poids_total-1)
+            tirage = rd.uniform(0,poids_total)
             k = 0
             while tirage > 0:
                 tirage -= regle[k][0]