diff --git a/pybtc/connector/block_loader.py b/pybtc/connector/block_loader.py
index 179d319..8594888 100644
--- a/pybtc/connector/block_loader.py
+++ b/pybtc/connector/block_loader.py
@@ -165,7 +165,7 @@ class BlockLoader:
 
             if msg_type == b'result':
                 self.worker_busy[index] = False
-                if len(msg) < 80000000:
+                if len(msg) < 80000000 and self.rpc_batch_limit < 300:
                     self.rpc_batch_limit += 10
                 elif len(msg) > 100000000 and self.rpc_batch_limit > 10:
                     self.rpc_batch_limit -= 10