diff --git a/src/peer_connection.cpp b/src/peer_connection.cpp
index 80667664f..98f7385c4 100644
--- a/src/peer_connection.cpp
+++ b/src/peer_connection.cpp
@@ -1977,7 +1977,7 @@ namespace libtorrent
 #endif
 			}
 		}
-		TORRENT_ASSERT(int(m_download_queue.size()) > block_index + 1);
+		TORRENT_ASSERT(int(m_download_queue.size()) > block_index);
 		b = m_download_queue.begin() + block_index;
 		TORRENT_ASSERT(*b == pending_b);