diff --git a/jaxpm/painting.py b/jaxpm/painting.py
index f3c50df..78d63ef 100644
--- a/jaxpm/painting.py
+++ b/jaxpm/painting.py
@@ -134,7 +134,6 @@ def cic_paint_2d(mesh, positions, weight):
     positions: [npart, 2]
     weight: [npart]
     """
-    positions = positions.reshape([-1, 2])
     positions = jnp.expand_dims(positions, 1)
     floor = jnp.floor(positions)
     connection = jnp.array([[0, 0], [1., 0], [0., 1], [1., 1]])
@@ -143,7 +142,7 @@ def cic_paint_2d(mesh, positions, weight):
     kernel = 1. - jnp.abs(positions - neighboor_coords)
     kernel = kernel[..., 0] * kernel[..., 1]
     if weight is not None:
-        kernel = kernel * weight.reshape(*positions.shape[:-1])
+        kernel = kernel * weight[..., jnp.newaxis]
 
     neighboor_coords = jnp.mod(
         neighboor_coords.reshape([-1, 4, 2]).astype('int32'),