diff --git a/codex/node.nim b/codex/node.nim
index f78e2c91..c5eb20b0 100644
--- a/codex/node.nim
+++ b/codex/node.nim
@@ -290,7 +290,7 @@ proc requestStorage*(
       # because the slotSize is used to determine the amount of bytes to reserve
       # in a Reservations
       # TODO: slotSize: (encoded.blockSize.int * encoded.steps).u256,
-      slotSize: (encoded.blockSize.int * encoded.blocks.len).u256,
+      slotSize: (encoded.blockSize.int * (encoded.blocks.len - 1)).u256,
       duration: duration,
       proofProbability: proofProbability,
       reward: reward,