diff --git a/Sources/ContainerizationEXT4/EXT4+Formatter.swift b/Sources/ContainerizationEXT4/EXT4+Formatter.swift
index d73d1a8e..55efa9a8 100644
--- a/Sources/ContainerizationEXT4/EXT4+Formatter.swift
+++ b/Sources/ContainerizationEXT4/EXT4+Formatter.swift
@@ -1135,7 +1135,7 @@ extension EXT4 {
                     let offset = i * extentsPerBlock * EXT4.MaxBlocksPerExtent
                     fillExtents(
                         node: &leafNode, numExtents: extentsInBlock, numBlocks: dataBlocks,
-                        start: blocks.start + offset,
+                        start: blocks.start,
                         offset: offset)
                     try withUnsafeLittleEndianBytes(of: leafNode.header) { bytes in
                         try self.handle.write(contentsOf: bytes)