diff --git a/tinygrad/utils.py b/tinygrad/utils.py
index 44d7678e..b926f2fc 100644
--- a/tinygrad/utils.py
+++ b/tinygrad/utils.py
@@ -41,6 +41,7 @@ def get_im2col_indexes(oy, ox, cin, H, W):
 
 def im2col(x, H, W):
   bs,cin,oy,ox = x.shape[0], x.shape[1], x.shape[2]-(H-1), x.shape[3]-(W-1)
+
   ic, iy, ix = get_im2col_indexes(oy, ox, cin, H, W)
   tx = x[:, ic, iy, ix]
   return tx.reshape(-1, cin*W*H)
@@ -49,10 +50,20 @@ def col2im(tx, H, W, OY, OX):
   oy, ox = OY-(H-1), OX-(W-1)
   bs = tx.shape[0] // (oy * ox)
   cin = tx.shape[1] // (H * W)
-  tx = tx.reshape(bs, oy, ox, cin, H, W)
-
   x = np.zeros((bs, cin, OY, OX), dtype=tx.dtype)
+
+  """
+  # col2im is just im2col in reverse
+  tx = tx.reshape(bs, -1)
+  ic, iy, ix = get_im2col_indexes(oy, ox, cin, H, W)
+  np.add.at(x, (slice(None), ic, iy, ix), tx)
+  """
+
+  # sadly, this is faster
+  tx = tx.reshape(bs, oy, ox, cin, H, W)
   for Y in range(oy):
     for X in range(ox):
       x[:, :, Y:Y+H, X:X+W] += tx[:, Y, X]
+
   return x
+