diff --git a/eo/src/utils/eoParallel.cpp b/eo/src/utils/eoParallel.cpp
index 3ab25e7f5..c590c7ade 100644
--- a/eo/src/utils/eoParallel.cpp
+++ b/eo/src/utils/eoParallel.cpp
@@ -66,7 +66,35 @@ void eoParallel::_createParameters( eoParser& parser )
     std::string section("Parallelization");
     parser.processParam( _isEnabled, section );
     parser.processParam( _isDynamic, section );
+
+    std::string default_value( _prefix.defValue() );
+
+    if ( _isEnabled.value() )
+	{
+	    if ( _isDynamic.value() )
+		{
+		    default_value += "_dynamic.out";
+		}
+	    else
+		{
+		    default_value += "_parallel.out";
+		}
+	}
+    else
+	{
+	    default_value += "_sequential.out";
+	}
+
+    _prefix.defValue( default_value );
+
+    std::cout << "defvalue: " << _prefix.defValue() << std::endl;
+
     parser.processParam( _prefix, section );
+
+    std::cout << "value: " << parser.getParamWithLongName("parallelize-prefix")->getValue() << std::endl;
+
+    std::cout << "defvalue: " << _prefix.defValue() << std::endl;
+
 }
 
 void make_parallel(eoParser& parser)