diff --git a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.cpp b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.cpp
index e808411d5d..4e2526445d 100644
--- a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.cpp
@@ -731,7 +731,7 @@ bool RimFaultReactivationModel::extractAndExportModelData()
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-std::array<double, 3> RimFaultReactivationModel::materialParameters( ElementSets elementSet )
+std::array<double, 3> RimFaultReactivationModel::materialParameters( ElementSets elementSet ) const
 {
     std::array<double, 3>                     retVal   = { 0.0, 0.0, 0.0 };
     static std::map<ElementSets, std::string> groupMap = { { ElementSets::OverBurden, "material_overburden" },
diff --git a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.h b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.h
index bca610e1d6..298d6d6577 100644
--- a/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.h
+++ b/ApplicationLibCode/ProjectDataModel/Faults/RimFaultReactivationModel.h
@@ -108,7 +108,7 @@ class RimFaultReactivationModel : public RimCheckableNamedObject, public RimPoly
 
     std::vector<QDateTime> selectedTimeSteps() const;
 
-    std::array<double, 3> materialParameters( ElementSets elementSet );
+    std::array<double, 3> materialParameters( ElementSets elementSet ) const;
 
     QStringList commandParameters() const;