diff --git a/abcvoting/generate.py b/abcvoting/generate.py
index f6bffd1..52e04d2 100644
--- a/abcvoting/generate.py
+++ b/abcvoting/generate.py
@@ -886,11 +886,11 @@ def __init__(self, name, center_point=0.5, sigma=0.15, width=1.0):
 
         try:
             len(center_point)
-            self.center_point = np.array(center_point)
+            self.center_point = np.array(center_point, dtype=float)
             if len(self.center_point) != self.dimension:
                 raise ValueError("Center point has a wrong dimension.")
         except TypeError:
-            self.center_point = np.array([center_point] * self.dimension)
+            self.center_point = np.array([center_point] * self.dimension, dtype=float)
 
     def prefsampling_function(self):
         if self.name == "1d_interval":