diff --git a/opm/models/blackoil/blackoilprimaryvariables.hh b/opm/models/blackoil/blackoilprimaryvariables.hh
index 54f85f2471..e2638aac65 100644
--- a/opm/models/blackoil/blackoilprimaryvariables.hh
+++ b/opm/models/blackoil/blackoilprimaryvariables.hh
@@ -269,7 +269,7 @@ public:
         bool onlyWater = FluidSystem::phaseIsActive(waterPhaseIdx)?(fluidState.saturation(waterPhaseIdx) > thresholdWaterFilledCell):false;
 
         // deal with the primary variables for the energy extension
-        EnergyModule::assignPrimaryVars(*this, fluidState);
+        EnergyModule::assignPrimaryVars(asImp_(), fluidState);
 
         // determine the meaning of the primary variables
         if (FluidSystem::numActivePhases() == 1) {