diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index ca96635a0..9684dc969 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -39,6 +39,7 @@ list (APPEND MAIN_SOURCE_FILES
   opm/simulators/timestepping/gatherConvergenceReport.cpp
   opm/simulators/utils/DeferredLogger.cpp
   opm/simulators/utils/gatherDeferredLogger.cpp
+  opm/simulators/utils/ParallelFileMerger.cpp
   opm/simulators/utils/ParallelRestart.cpp
   opm/simulators/wells/GroupState.cpp
   opm/simulators/wells/WGState.cpp
diff --git a/opm/simulators/utils/ParallelFileMerger.cpp b/opm/simulators/utils/ParallelFileMerger.cpp
new file mode 100644
index 000000000..7e9268f27
--- /dev/null
+++ b/opm/simulators/utils/ParallelFileMerger.cpp
@@ -0,0 +1,113 @@
+/*
+  Copyright 2016 Dr. Blatt - HPC-Simulation-Software & Services
+  Copyright 2016 STATOIL AS.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <opm/simulators/utils/ParallelFileMerger.hpp>
+#include <iostream>
+
+namespace Opm
+{
+namespace detail
+{
+
+ParallelFileMerger::ParallelFileMerger(const fs::path& output_dir,
+                                       const std::string& deckname,
+                                       bool show_fallout)
+    : debugFileRegex_(deckname+"\\.\\d+\\.DBG"),
+      logFileRegex_(deckname+"\\.\\d+\\.PRT"),
+      fileWarningRegex_(deckname+"\\.(\\d+)\\.[^.]+"),
+      show_fallout_(show_fallout)
+{
+    if ( show_fallout_ )
+    {
+        auto debugPath = output_dir;
+        debugPath /= (deckname + ".DBG");
+        debugStream_.reset(new std::ofstream(debugPath,
+                                             std::ofstream::app));
+        auto logPath = output_dir;
+        logPath /= ( deckname + ".PRT");
+        logStream_.reset(new std::ofstream(logPath,
+                                           std::ofstream::app));
+    }
+}
+
+void ParallelFileMerger::operator()(const fs::path& file)
+{
+    std::smatch matches;
+    std::string filename = file.filename().native();
+
+    if ( std::regex_match(filename, matches, fileWarningRegex_) )
+    {
+        std::string rank = std::regex_replace(filename, fileWarningRegex_, "\\1");
+
+        if( std::regex_match(filename, logFileRegex_) )
+        {
+            if ( show_fallout_ ){
+                appendFile(*logStream_, file, rank);
+            }else{
+                fs::remove(file);
+            }
+        }
+        else
+        {
+            if (std::regex_match(filename, debugFileRegex_)  )
+            {
+                if ( show_fallout_ ){
+                    appendFile(*debugStream_, file, rank);
+                }else{
+                    fs::remove(file);
+                }
+            }
+            else
+            {
+                if ( show_fallout_ ){
+                    std::cerr << "WARNING: Unrecognized file with name "
+                                  << filename
+                                  << " that might stem from a  parallel run."
+                                  << std::endl;
+                }
+            }
+        }
+    }
+}
+
+void ParallelFileMerger::appendFile(std::ofstream& of, const fs::path& file, const std::string& rank)
+{
+    if( fs::file_size(file) )
+    {
+        std::cerr << "WARNING: There has been logging to file "
+                      << file.string() <<" by process "
+                      << rank << std::endl;
+
+        std::ifstream in(file);
+        of<<std::endl<< std::endl;
+        of<<"=======================================================";
+        of<<std::endl<<std::endl;
+        of << " Output written by rank " << rank << " to file " << file.string();
+        of << ":" << std::endl << std::endl;
+        of << in.rdbuf() << std::endl << std::endl;
+        of << "======================== end output =====================";
+        of << std::endl;
+        in.close();
+    }
+    fs::remove(file);
+}
+
+} // end namespace detail
+} // end namespace Opm
diff --git a/opm/simulators/utils/ParallelFileMerger.hpp b/opm/simulators/utils/ParallelFileMerger.hpp
index c297c5893..1c8438dba 100644
--- a/opm/simulators/utils/ParallelFileMerger.hpp
+++ b/opm/simulators/utils/ParallelFileMerger.hpp
@@ -21,11 +21,13 @@
 #ifndef OPM_PARALLELFILEMERGER_HEADER_INCLUDED
 #define OPM_PARALLELFILEMERGER_HEADER_INCLUDED
 
+#include <fstream>
 #include <memory>
-#include <iostream>
+#include <regex>
+#include <string>
 
 #include <opm/common/utility/FileSystem.hpp>
-#include <regex>
+
 
 namespace Opm
 {
@@ -45,93 +47,19 @@ class ParallelFileMerger
 public:
     /// \brief Constructor
     /// \param output_dir The output directory to use for reading/Writing.
-    /// \param deckanme The name of the deck.
+    /// \param deckname The name of the deck.
     ParallelFileMerger(const fs::path& output_dir,
                        const std::string& deckname,
-                       bool show_fallout = false)
-        : debugFileRegex_(deckname+"\\.\\d+\\.DBG"),
-          logFileRegex_(deckname+"\\.\\d+\\.PRT"),
-          fileWarningRegex_(deckname+"\\.(\\d+)\\.[^.]+"),
-          show_fallout_(show_fallout)
-    {
-        if ( show_fallout_ )
-        {
-            auto debugPath = output_dir;
-            debugPath /= (deckname + ".DBG");
-            debugStream_.reset(new std::ofstream(debugPath,
-                                                std::ofstream::app));
-            auto logPath = output_dir;
-            logPath /= ( deckname + ".PRT");
-            logStream_.reset(new std::ofstream(logPath,
-                                              std::ofstream::app));
-        }
-    }
+                       bool show_fallout = false);
 
-    void operator()(const fs::path& file)
-    {
-        std::smatch matches;
-        std::string filename = file.filename().native();
+    void operator()(const fs::path& file);
 
-        if ( std::regex_match(filename, matches, fileWarningRegex_) )
-        {
-            std::string rank = std::regex_replace(filename, fileWarningRegex_, "\\1");
-
-            if( std::regex_match(filename, logFileRegex_) )
-            {
-                if ( show_fallout_ ){
-                    appendFile(*logStream_, file, rank);
-                }else{
-                    fs::remove(file);
-                }
-            }
-            else
-            {
-                if (std::regex_match(filename, debugFileRegex_)  )
-                {
-                    if ( show_fallout_ ){
-                        appendFile(*debugStream_, file, rank);
-                    }else{
-                        fs::remove(file);
-                    }
-                }
-                else
-                {
-                    if ( show_fallout_ ){
-                        std::cerr << "WARNING: Unrecognized file with name "
-                                  << filename
-                                  << " that might stem from a  parallel run."
-                                  << std::endl;
-                    }
-                }
-            }
-        }
-    }
 private:
     /// \brief Append contents of a file to a stream
     /// \brief of The output stream to use.
     /// \brief file The file whose content to append.
     /// \brief rank The rank that wrote the file.
-    void appendFile(std::ofstream& of, const fs::path& file, const std::string& rank)
-    {
-        if( fs::file_size(file) )
-        {
-            std::cerr << "WARNING: There has been logging to file "
-                      << file.string() <<" by process "
-                      << rank << std::endl;
-
-            std::ifstream in(file);
-            of<<std::endl<< std::endl;
-            of<<"=======================================================";
-            of<<std::endl<<std::endl;
-            of << " Output written by rank " << rank << " to file " << file.string();
-            of << ":" << std::endl << std::endl;
-            of << in.rdbuf() << std::endl << std::endl;
-            of << "======================== end output =====================";
-            of << std::endl;
-            in.close();
-        }
-        fs::remove(file);
-    }
+    void appendFile(std::ofstream& of, const fs::path& file, const std::string& rank);
 
     /// \brief Regex to capture *.DBG
     std::regex debugFileRegex_;
@@ -147,5 +75,5 @@ private:
     bool show_fallout_;
 };
 } // end namespace detail
-} // end namespace OPM
+} // end namespace Opm
 #endif // end header guard