diff --git a/consensus/posv/posv.go b/consensus/posv/posv.go
index 254a568176..286167581c 100644
--- a/consensus/posv/posv.go
+++ b/consensus/posv/posv.go
@@ -49,7 +49,7 @@ import (
 
 const (
 	inmemorySnapshots      = 128 // Number of recent vote snapshots to keep in memory
-	blockSignersCacheLimit = 36000
+	blockSignersCacheLimit = 9000
 	M2ByteLength           = 4
 )