diff --git a/CPP/7zip/Archive/NtfsHandler.cpp b/CPP/7zip/Archive/NtfsHandler.cpp
index 7d0c6f780..2c8fe8104 100644
--- a/CPP/7zip/Archive/NtfsHandler.cpp
+++ b/CPP/7zip/Archive/NtfsHandler.cpp
@@ -120,7 +120,7 @@ bool CHeader::Parse(const Byte *p)
       return false;
     sectorsPerClusterLog = t;
     ClusterSizeLog = SectorSizeLog + sectorsPerClusterLog;
-    if (ClusterSizeLog > 30)
+    if (ClusterSizeLog > 21)
       return false;
   }