diff --git a/opm/simulators/wells/StandardWellAssemble.cpp b/opm/simulators/wells/StandardWellAssemble.cpp
index f8e7d987e..263a7b3e4 100644
--- a/opm/simulators/wells/StandardWellAssemble.cpp
+++ b/opm/simulators/wells/StandardWellAssemble.cpp
@@ -91,7 +91,7 @@ assembleControlEq(const WellState<Scalar>& well_state,
                   const Well::InjectionControls& inj_controls,
                   const Well::ProductionControls& prod_controls,
                   const PrimaryVariables& primary_variables,
-                  const double rho,
+                  const Scalar rho,
                   StandardWellEquations<Scalar,Indices::numEq>& eqns1,
                   DeferredLogger& deferred_logger) const
 {
diff --git a/opm/simulators/wells/StandardWellAssemble.hpp b/opm/simulators/wells/StandardWellAssemble.hpp
index 93ebaf865..fc4d416de 100644
--- a/opm/simulators/wells/StandardWellAssemble.hpp
+++ b/opm/simulators/wells/StandardWellAssemble.hpp
@@ -59,7 +59,7 @@ public:
                            const Well::InjectionControls& inj_controls,
                            const Well::ProductionControls& prod_controls,
                            const PrimaryVariables& primary_variables,
-                           const double rho,
+                           const Scalar rho,
                            StandardWellEquations<Scalar,Indices::numEq>& eqns,
                            DeferredLogger& deferred_logger) const;