diff --git a/examples/test_util/EclFilesComparator.cpp b/examples/test_util/EclFilesComparator.cpp
index 91268d64b..435c5b104 100644
--- a/examples/test_util/EclFilesComparator.cpp
+++ b/examples/test_util/EclFilesComparator.cpp
@@ -288,6 +288,19 @@ double ECLFilesComparator::average(const std::vector<double>& vec) {
 
 
 
+double ECLFilesComparator::getCellVolume(const ecl_grid_type* ecl_grid,
+                                         const int globalIndex) {
+    std::vector<double> x(8, 0.0);
+    std::vector<double> y(8, 0.0);
+    std::vector<double> z(8, 0.0);
+    for (int i = 0; i < 8; i++) {
+        ecl_grid_get_cell_corner_xyz1(ecl_grid, globalIndex, i, &x.data()[i], &y.data()[i], &z.data()[i]);
+    }
+    return calculateCellVol(x,y,z);
+}
+
+
+
 void ECLRegressionTest::printResultsForKeyword(const std::string& keyword) const {
     std::cout << "Deviation results for keyword " << keyword << " of type "
         << ecl_type_get_name(ecl_file_iget_named_data_type(ecl_file1, keyword.c_str(), 0))
@@ -417,20 +430,6 @@ void ECLRegressionTest::deviationsForCell(double val1, double val2,
 
 
 
-namespace {
-    double getCellVolume(const ecl_grid_type* ecl_grid, const int globalIndex) {
-        std::vector<double> x(8, 0.0);
-        std::vector<double> y(8, 0.0);
-        std::vector<double> z(8, 0.0);
-        for (int i = 0; i < 8; i++) {
-            ecl_grid_get_cell_corner_xyz1(ecl_grid, globalIndex, i, &x.data()[i], &y.data()[i], &z.data()[i]);
-        }
-        return calculateCellVol(x,y,z);
-    }
-}
-
-
-
 void ECLRegressionTest::gridCompare(const bool volumecheck) const {
     double absTolerance = getAbsTolerance();
     double relTolerance = getRelTolerance();
diff --git a/examples/test_util/EclFilesComparator.hpp b/examples/test_util/EclFilesComparator.hpp
index 1306a75e0..536253a6d 100644
--- a/examples/test_util/EclFilesComparator.hpp
+++ b/examples/test_util/EclFilesComparator.hpp
@@ -129,6 +129,8 @@ class ECLFilesComparator {
         //! \brief Calculate average of a vector.
         //! \details Returning the average of the input vector, i.e. the sum of all values divided by the number of elements.
         static double average(const std::vector<double>& vec);
+         //! \brief Obtain the volume of a cell.
+        static double getCellVolume(const ecl_grid_type* ecl_grid, const int globalIndex);
 };