diff --git a/ApplicationLibCode/Application/RiaPreferencesGrid.cpp b/ApplicationLibCode/Application/RiaPreferencesGrid.cpp
index a961af4c84..6e89a69fab 100644
--- a/ApplicationLibCode/Application/RiaPreferencesGrid.cpp
+++ b/ApplicationLibCode/Application/RiaPreferencesGrid.cpp
@@ -317,3 +317,19 @@ void RiaPreferencesGrid::setGridModelReaderOverride( const std::string& readerNa
 
     m_gridModelReaderOverride = readerType;
 }
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+void RiaPreferencesGrid::setGridModelReaderOverride( const RiaDefines::GridModelReader readerType )
+{
+    m_gridModelReaderOverride = readerType;
+}
+
+//--------------------------------------------------------------------------------------------------
+///
+//--------------------------------------------------------------------------------------------------
+RiaDefines::GridModelReader RiaPreferencesGrid::gridModelReaderOverride() const
+{
+    return m_gridModelReaderOverride;
+}
diff --git a/ApplicationLibCode/Application/RiaPreferencesGrid.h b/ApplicationLibCode/Application/RiaPreferencesGrid.h
index c748e6ce54..8e95831dc8 100644
--- a/ApplicationLibCode/Application/RiaPreferencesGrid.h
+++ b/ApplicationLibCode/Application/RiaPreferencesGrid.h
@@ -58,7 +58,10 @@ public:
     bool    invalidateLongThinCells() const;
 
     RiaDefines::GridModelReader gridModelReader() const;
+
     void                        setGridModelReaderOverride( const std::string& readerName );
+    void                        setGridModelReaderOverride( const RiaDefines::GridModelReader readerType );
+    RiaDefines::GridModelReader gridModelReaderOverride() const;
 
     void appendItems( caf::PdmUiOrdering& uiOrdering );
 
diff --git a/ApplicationLibCode/ProjectDataModel/ContourMap/RimStatisticsContourMap.cpp b/ApplicationLibCode/ProjectDataModel/ContourMap/RimStatisticsContourMap.cpp
index 989fea936f..8620ccf41c 100644
--- a/ApplicationLibCode/ProjectDataModel/ContourMap/RimStatisticsContourMap.cpp
+++ b/ApplicationLibCode/ProjectDataModel/ContourMap/RimStatisticsContourMap.cpp
@@ -533,8 +533,11 @@ void RimStatisticsContourMap::computeStatistics()
 
     caf::ProgressInfo progInfo( nCases, QString( "Reading Eclipse Ensemble" ) );
 
-    auto readerSettings = RiaPreferencesGrid::current()->gridOnlyReaderSettings();
-    auto casesInViews   = ensemble->casesInViews();
+    auto readerSettings                = RiaPreferencesGrid::current()->gridOnlyReaderSettings();
+    readerSettings.onlyLoadActiveCells = true;
+    auto casesInViews                  = ensemble->casesInViews();
+    auto oldReaderType                 = RiaPreferencesGrid::current()->gridModelReaderOverride();
+    RiaPreferencesGrid::current()->setGridModelReaderOverride( RiaDefines::GridModelReader::OPM_COMMON );
 
     int i = 1;
     for ( RimEclipseCase* eCase : ensemble->cases() )
@@ -591,6 +594,8 @@ void RimStatisticsContourMap::computeStatistics()
         }
     }
 
+    RiaPreferencesGrid::current()->setGridModelReaderOverride( oldReaderType );
+
     m_contourMapGrid = std::move( contourMapGrid );
 
     doStatisticsCalculation( timestep_results );