diff --git a/core/chain_manager.go b/core/chain_manager.go
index e67439bb6e..3adaf33445 100644
--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -36,7 +36,7 @@ var (
 )
 
 const (
-	blockCacheLimit     = 10000
+	blockCacheLimit     = 256
 	maxFutureBlocks     = 256
 	maxTimeFutureBlocks = 30
 )