Index: trunk/MagicSoft/Mars/mfileio/MWriteRootFile.cc
===================================================================
--- trunk/MagicSoft/Mars/mfileio/MWriteRootFile.cc	(revision 9410)
+++ trunk/MagicSoft/Mars/mfileio/MWriteRootFile.cc	(revision 9472)
@@ -248,5 +248,5 @@
     // Check if we are writing to memory
     //
-    if (opt.Contains("memory", TString::kIgnoreCase))
+    if (opt=="memory")
     {
         fSplitRule = fname;