diff --git a/Sources/BZip2/BZip2+BlockSize.swift b/Sources/BZip2/BZip2+BlockSize.swift
index 36dd024f..be89cb48 100644
--- a/Sources/BZip2/BZip2+BlockSize.swift
+++ b/Sources/BZip2/BZip2+BlockSize.swift
@@ -60,7 +60,7 @@ public extension BZip2 {
         }
 
         var sizeInBytes: Int {
-            return self.rawValue * 100 * 1000
+            return self.rawValue * 100 * 800
         }
 
     }