diff --git a/vega/p3d_model.py b/vega/p3d_model.py
index 2e448e7..9cf3d6e 100644
--- a/vega/p3d_model.py
+++ b/vega/p3d_model.py
@@ -43,7 +43,7 @@ def __init__(self, config, pk_coordinates, window_path):
             self.legendre_xi[ell] = special.legendre(ell)
 
         self.window_rfunc = np.vectorize(self.scalar_window_rfunc)
-        self.window_r = self.window_rfunc(self.r_regular_grid / r_max_window)
+        self.window_r = self.window_rfunc(self.r_window_grid / r_max_window)
 
         # TODO add more options here
         self.sph_kernels = self.compute_sph_kernels(