diff --git a/netdissect/runningstats.py b/netdissect/runningstats.py
index 91adeb7..f67e73f 100644
--- a/netdissect/runningstats.py
+++ b/netdissect/runningstats.py
@@ -1017,7 +1017,7 @@ def add(self, a):
         centered = a - batch_mean
         # If more than 10 billion operations, divide into batches.
         if self.split_batch:
-            sub_batch = -(-(10 << 30) // (a.shape[1] * a.shape[1])
+            sub_batch = -(-(10 << 30)) // (a.shape[1] * a.shape[1])
         else:
             sub_batch = None
         # Initial batch.