diff --git a/tinygrad/tensor.py b/tinygrad/tensor.py
index 0c83c1cb91..917f14f958 100644
--- a/tinygrad/tensor.py
+++ b/tinygrad/tensor.py
@@ -407,7 +407,7 @@ class Tensor:
     order = list(range(len(self.shape)))
     order[ax1], order[ax2] = order[ax2], order[ax1]
     return self.permute(order)
-  def flatten(self, start_dim=0): return self.reshape(shape=tuple(list(self.shape[0:start_dim]) + [-1]))
+  def flatten(self, start_dim=0): return self.reshape(shape=self.shape[:start_dim] + (-1,))
 
   # ***** reduce ops *****