Index: trunk/FACT++/src/DataWriteRaw.cc
===================================================================
--- trunk/FACT++/src/DataWriteRaw.cc	(revision 15463)
+++ trunk/FACT++/src/DataWriteRaw.cc	(revision 15464)
@@ -57,5 +57,5 @@
     {
         WriteBlockHeader(kBoardHeader, 1, i, sizeof(PEVNT_HEADER));
-        fOut.write(reinterpret_cast<char*>(h->FADhead+i), sizeof(PEVNT_HEADER));
+        fOut.write(reinterpret_cast<const char*>(h->FADhead+i), sizeof(PEVNT_HEADER));
     }