diff --git a/src/osgDB/Archive.cpp b/src/osgDB/Archive.cpp
index db90d89c6..24703f441 100644
--- a/src/osgDB/Archive.cpp
+++ b/src/osgDB/Archive.cpp
@@ -80,7 +80,6 @@ Archive::IndexBlock* Archive::IndexBlock::read(std::istream& in, bool doEndianSw
     
     if (doEndianSwap)
     {
-        osg::swapBytes(reinterpret_cast<char*>(&indexBlock->_blockSize), sizeof(indexBlock->_blockSize));
         osg::swapBytes(reinterpret_cast<char*>(&indexBlock->_blockSize), sizeof(indexBlock->_blockSize));
         osg::swapBytes(reinterpret_cast<char*>(&indexBlock->_filePositionNextIndexBlock), sizeof(indexBlock->_filePositionNextIndexBlock));
         osg::swapBytes(reinterpret_cast<char*>(&indexBlock->_offsetOfNextAvailableSpace), sizeof(indexBlock-> _offsetOfNextAvailableSpace));