diff --git a/libs/fastfile/360/fastfile_cod4_360.cpp b/libs/fastfile/360/fastfile_cod4_360.cpp
index 90fbb14..48c85fb 100644
--- a/libs/fastfile/360/fastfile_cod4_360.cpp
+++ b/libs/fastfile/360/fastfile_cod4_360.cpp
@@ -80,9 +80,9 @@ bool FastFile_COD4_360::Load(const QByteArray aData) {
         // For COD5, simply decompress from offset 12.
         decompressedData = Compression::DecompressZLIB(aData.mid(12));
     } else if (header == "IWff0100") {
-        // Create a QDataStream on the input data.
-        QDataStream fastFileStream(aData.mid(12));
-        fastFileStream.setByteOrder(QDataStream::LittleEndian);
+        // Create a XDataStream on the input data.
+        XDataStream fastFileStream(aData.mid(12));
+        fastFileStream.setByteOrder(XDataStream::LittleEndian);
 
         QByteArray magic(8, Qt::Uninitialized);
         fastFileStream.readRawData(magic.data(), 8);