diff --git a/Tests/Functional/TestMachinery/ParameterPlan.cpp b/Tests/Functional/TestMachinery/ParameterPlan.cpp
deleted file mode 100644
index a45536afe5bd8bf76291f0a29a0c2dd2eefe552e..0000000000000000000000000000000000000000
--- a/Tests/Functional/TestMachinery/ParameterPlan.cpp
+++ /dev/null
@@ -1,27 +0,0 @@
-// ************************************************************************** //
-//
-//  BornAgain: simulate and fit scattering at grazing incidence
-//
-//! @file      Tests/Functional/TestMachinery/ParameterPlan.cpp
-//! @brief     Implements class ParameterPlan
-//!
-//! @homepage  http://www.bornagainproject.org
-//! @license   GNU General Public License v3 or higher (see COPYING)
-//! @copyright Forschungszentrum Jülich GmbH 2018
-//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
-//
-// ************************************************************************** //
-
-#include "ParameterPlan.h"
-
-using namespace Fit;
-
-ParameterPlan::ParameterPlan(const Parameter& param, double expected_value, double tolerance)
-    : m_expected_value(expected_value), m_tolerance(tolerance), m_parameter(param)
-{
-}
-
-Parameter ParameterPlan::fitParameter() const
-{
-    return m_parameter;
-}
diff --git a/Tests/Functional/TestMachinery/ParameterPlan.h b/Tests/Functional/TestMachinery/ParameterPlan.h
index a8b25b28062274a0c512d9dd060c44c3dc000674..5833afd5b74092d4058f8cd60459e366618c31b5 100644
--- a/Tests/Functional/TestMachinery/ParameterPlan.h
+++ b/Tests/Functional/TestMachinery/ParameterPlan.h
@@ -24,13 +24,13 @@
 class BA_CORE_API_ ParameterPlan
 {
 public:
-    ParameterPlan(const Fit::Parameter& param, double expected_value, double tolerance = 0.01);
-
-    Fit::Parameter fitParameter() const;
+    ParameterPlan(const Fit::Parameter& param, double expected_value, double tolerance = 0.01)
+     : m_expected_value(expected_value), m_tolerance(tolerance), m_parameter(param) {}
 
+    Fit::Parameter fitParameter() const { return m_parameter; }
     double expectedValue() const { return m_expected_value; }
-
     double tolerance() const { return m_tolerance; }
+
     void setTolerance(double tolerance) { m_tolerance = tolerance; }
 
 private: