diff --git a/src/cryptonote_protocol/block_queue.cpp b/src/cryptonote_protocol/block_queue.cpp
index 672696944..716b0c8ba 100644
--- a/src/cryptonote_protocol/block_queue.cpp
+++ b/src/cryptonote_protocol/block_queue.cpp
@@ -240,7 +240,7 @@ std::pair<uint64_t, uint64_t> block_queue::reserve_span(uint64_t first_block_hei
     MDEBUG("reserve_span: early out: first_block_height " << first_block_height << ", last_block_height " << last_block_height << ", max_blocks " << max_blocks);
     return std::make_pair(0, 0);
   }
-  if (block_hashes.size() >= last_block_height)
+  if (block_hashes.size() > last_block_height)
   {
     MDEBUG("reserve_span: more block hashes than fit within last_block_height: " << block_hashes.size() << " and " << last_block_height);
     return std::make_pair(0, 0);