diff --git a/src/core/logging/Logging.cpp b/src/core/logging/Logging.cpp
index 60fc970bc461b770558d9dd674ef5e0060ca639d..0c3718d0f37ad16ae845828d22349b6bbc595ec8 100644
--- a/src/core/logging/Logging.cpp
+++ b/src/core/logging/Logging.cpp
@@ -22,6 +22,7 @@
 #include "Logging.h"
 
 #include "core/Filesystem.h"
+#include "core/Regex.h"
 #include <ctime>
 
 
@@ -195,6 +196,23 @@ std::string Logging::createLog( const std::string & type, const std::string & me
 }
 
 
+bool Logging::isInIgnoreCallerPaths( const std::vector< walberla::regex > & regexes,
+                                            const std::string & callerPath, const int line ) const
+{
+   if( !regexes.empty() )
+   {
+      std::stringstream callerPathAndLine;
+      callerPathAndLine << callerPath << ":" << line;
+
+      for( auto regex = regexes.begin(); regex != regexes.end(); ++regex )
+         if( walberla::regex_search( callerPathAndLine.str(), *regex ) )
+            return true;
+   }
+
+   return false;
+}
+
+
 
 } // namespace logging
 } // namespace walberla
diff --git a/src/core/logging/Logging.h b/src/core/logging/Logging.h
index d3671e0ea3910bc7736710bfb7110930ff299600..1a43778516e837e874fed0dda040c25508b93c06 100644
--- a/src/core/logging/Logging.h
+++ b/src/core/logging/Logging.h
@@ -140,8 +140,8 @@ private:
 
    inline Logging();
 
-   inline bool isInIgnoreCallerPaths( const std::vector< walberla::regex > & regexes,
-                                      const std::string & callerPath, const int line ) const;
+   bool isInIgnoreCallerPaths( const std::vector< walberla::regex > & regexes,
+                               const std::string & callerPath, const int line ) const;
 
    inline void logError   ( const std::string & message, const std::string & callerPath, const int line );
    inline void logDevel   ( const std::string & message, const std::string & callerPath, const int line );
@@ -306,24 +306,6 @@ inline bool Logging::logTracing( const std::string & /*callerPath*/, const int /
 
 
 
-inline bool Logging::isInIgnoreCallerPaths( const std::vector< walberla::regex > & regexes,
-                                            const std::string & callerPath, const int line ) const
-{
-   if( !regexes.empty() )
-   {
-      std::stringstream callerPathAndLine;
-      callerPathAndLine << callerPath << ":" << line;
-
-      for( auto regex = regexes.begin(); regex != regexes.end(); ++regex )
-         if( walberla::regex_search( callerPathAndLine.str(), *regex ) )
-            return true;
-   }
-
-   return false;
-}
-
-
-
 inline void Logging::logError( const std::string & message, const std::string & callerPath, const int line )
 {
 #ifdef WALBERLA_THREAD_SAFE_LOGGING