diff --git a/ebos/eclfluxmodule.hh b/ebos/eclfluxmodule.hh
index 69facab4b..19557e97a 100644
--- a/ebos/eclfluxmodule.hh
+++ b/ebos/eclfluxmodule.hh
@@ -499,7 +499,7 @@ protected:
                     elemCtx.problem().materialLawParams(elemCtx,
                                                         interiorDofIdx,
                                                         /*timeIdx=*/0);
-                typename FluidState::Scalar kr[numPhases];
+                std::array<typename FluidState::Scalar,numPhases> kr;
                 MaterialLaw::relativePermeabilities(kr, matParams, exFluidState);
 
                 const auto& mob = kr[phaseIdx]/exFluidState.viscosity(phaseIdx);
diff --git a/opm/simulators/wells/MultisegmentWell_impl.hpp b/opm/simulators/wells/MultisegmentWell_impl.hpp
index 4f9af6d54..c8a71ff20 100644
--- a/opm/simulators/wells/MultisegmentWell_impl.hpp
+++ b/opm/simulators/wells/MultisegmentWell_impl.hpp
@@ -1148,7 +1148,7 @@ namespace Opm
         } else {
 
             const auto& paramsCell = materialLawManager->connectionMaterialLawParams(satid, cell_idx);
-            Eval relativePerms[3] = { 0.0, 0.0, 0.0 };
+            std::array<Eval,3> relativePerms = { 0.0, 0.0, 0.0 };
             MaterialLaw::relativePermeabilities(relativePerms, paramsCell, intQuants.fluidState());
 
             // reset the satnumvalue back to original
@@ -1200,7 +1200,7 @@ namespace Opm
         } else {
 
             const auto& paramsCell = materialLawManager->connectionMaterialLawParams(satid, cell_idx);
-            Scalar relativePerms[3] = { 0.0, 0.0, 0.0 };
+            std::array<Scalar,3> relativePerms = { 0.0, 0.0, 0.0 };
             MaterialLaw::relativePermeabilities(relativePerms, paramsCell, intQuants.fluidState());
 
             // reset the satnumvalue back to original
diff --git a/opm/simulators/wells/StandardWell_impl.hpp b/opm/simulators/wells/StandardWell_impl.hpp
index 3194634a1..a0d682fa0 100644
--- a/opm/simulators/wells/StandardWell_impl.hpp
+++ b/opm/simulators/wells/StandardWell_impl.hpp
@@ -812,7 +812,7 @@ namespace Opm
         } else {
 
             const auto& paramsCell = materialLawManager->connectionMaterialLawParams(satid, cell_idx);
-            Eval relativePerms[3] = { 0.0, 0.0, 0.0 };
+            std::array<Eval,3> relativePerms = { 0.0, 0.0, 0.0 };
             MaterialLaw::relativePermeabilities(relativePerms, paramsCell, intQuants.fluidState());
 
             // reset the satnumvalue back to original
@@ -881,7 +881,7 @@ namespace Opm
         } else {
 
             const auto& paramsCell = materialLawManager->connectionMaterialLawParams(satid, cell_idx);
-            Eval relativePerms[3] = { 0.0, 0.0, 0.0 };
+            std::array<Eval,3> relativePerms = { 0.0, 0.0, 0.0 };
             MaterialLaw::relativePermeabilities(relativePerms, paramsCell, intQuants.fluidState());
 
             // reset the satnumvalue back to original