diff --git a/opm/models/utils/parametersystem.hpp b/opm/models/utils/parametersystem.hpp
index 7618bde67..3fa230ee7 100644
--- a/opm/models/utils/parametersystem.hpp
+++ b/opm/models/utils/parametersystem.hpp
@@ -176,7 +176,7 @@ void parseParameterFile(const std::string& fileName, bool overwrite = true);
  *
  * \param os The \c std::ostream on which the message should be printed
  */
-void printValues(std::ostream& os = std::cout);
+void printValues(std::ostream& os);
 
 /*!
  * \ingroup Parameter
diff --git a/opm/models/utils/start.hh b/opm/models/utils/start.hh
index 0a97b32e3..ef8060b7d 100644
--- a/opm/models/utils/start.hh
+++ b/opm/models/utils/start.hh
@@ -358,7 +358,7 @@ static inline int start(int argc, char **argv,  bool registerParams=true)
             if (printParams) {
                 bool printSeparator = false;
                 if (printParams == 1 || !isatty(fileno(stdout))) {
-                    Parameters::printValues();
+                    Parameters::printValues(std::cout);
                     printSeparator = true;
                 }
                 else
diff --git a/opm/simulators/flow/FlowMain.hpp b/opm/simulators/flow/FlowMain.hpp
index d60baa992..df98a48aa 100644
--- a/opm/simulators/flow/FlowMain.hpp
+++ b/opm/simulators/flow/FlowMain.hpp
@@ -150,7 +150,7 @@ namespace Opm {
                 // deal with --print-parameters and unknown parameters.
                 if (Parameters::Get<Parameters::PrintParameters>() == 1) {
                     if (mpiRank == 0) {
-                        Parameters::printValues();
+                        Parameters::printValues(std::cout);
                     }
                     return -1;
                 }