diff --git a/AMDiS/src/io/FileWriterInterface.cc b/AMDiS/src/io/FileWriterInterface.cc
index 6c936cfc369bdbcfa53c4f6eec824a92cfa6c631..a9721e61f41710827cce291bd58aee6e8dc35542 100644
--- a/AMDiS/src/io/FileWriterInterface.cc
+++ b/AMDiS/src/io/FileWriterInterface.cc
@@ -85,7 +85,7 @@ namespace AMDiS {
 
 #if HAVE_PARALLEL_DOMAIN_AMDIS
     paraFilename = filename;
-    fn2 = fn + "_p" + boost::lexical_cast<std::string>(MPI::COMM_WORLD.Get_rank());
+    fn2 = fn + "_p" + boost::lexical_cast<std::string>(MPI::COMM_WORLD.Get_rank()) + ".";
     fn += "-p" + boost::lexical_cast<std::string>(MPI::COMM_WORLD.Get_rank()) + "-";
     postfix = "";
 #endif