diff --git a/opm/simulators/wells/MultisegmentWell.hpp b/opm/simulators/wells/MultisegmentWell.hpp
index 01b62c08f..96eea7ada 100644
--- a/opm/simulators/wells/MultisegmentWell.hpp
+++ b/opm/simulators/wells/MultisegmentWell.hpp
@@ -240,6 +240,7 @@ namespace Opm
         using Base::phaseUsage;
         using Base::name;
         using Base::flowPhaseToEbosCompIdx;
+        using Base::flowPhaseToEbosPhaseIdx;
         using Base::ebosCompIdxToFlowCompIdx;
         using Base::getAllowCrossFlow;
         using Base::scalingFactor;
diff --git a/opm/simulators/wells/MultisegmentWell_impl.hpp b/opm/simulators/wells/MultisegmentWell_impl.hpp
index 8fe543a8c..a1970d9cf 100644
--- a/opm/simulators/wells/MultisegmentWell_impl.hpp
+++ b/opm/simulators/wells/MultisegmentWell_impl.hpp
@@ -4336,7 +4336,7 @@ namespace Opm
             // the reciprocal FVF.
             const auto connMob =
                 mobility[ flowPhaseToEbosCompIdx(p) ].value()
-                * fs.invB(p).value();
+                * fs.invB(flowPhaseToEbosPhaseIdx(p)).value();
 
             connPI[p] = connPICalc(connMob);
         }
@@ -4393,6 +4393,6 @@ namespace Opm
 
         const auto zero   = EvalWell { 0.0 };
         const auto mt     = std::accumulate(mobility.begin(), mobility.end(), zero);
-        connII[phase_pos] = connIICalc(mt.value() * fs.invB(phase_pos).value());
+        connII[phase_pos] = connIICalc(mt.value() * fs.invB(flowPhaseToEbosPhaseIdx(phase_pos)).value());
     }
 } // namespace Opm