diff --git a/opm/core/pressure/HybridPressureSolver.hpp b/opm/core/pressure/HybridPressureSolver.hpp
index 58b64be4..6e7a934e 100644
--- a/opm/core/pressure/HybridPressureSolver.hpp
+++ b/opm/core/pressure/HybridPressureSolver.hpp
@@ -129,7 +129,7 @@ public:
                   const std::vector<double>& total_mobilities,
                   const std::vector<double>& omegas,
                   const std::vector<FlowBCTypes>& bctypes,
-                  const std::vector<double> bcvalues)
+                  const std::vector<double>& bcvalues)
     {
         if (state_ == Uninitialized) {
             throw std::runtime_error("Error in HybridPressureSolver::assemble(): You must call init() prior to calling assemble().");
diff --git a/opm/core/pressure/TPFAPressureSolver.hpp b/opm/core/pressure/TPFAPressureSolver.hpp
index d1988c88..cf19adfe 100644
--- a/opm/core/pressure/TPFAPressureSolver.hpp
+++ b/opm/core/pressure/TPFAPressureSolver.hpp
@@ -115,7 +115,7 @@ public:
                   const std::vector<double>& total_mobilities,
                   const std::vector<double>& omegas,
                   const std::vector<FlowBCTypes>& bctypes,
-                  const std::vector<double> bcvalues)
+                  const std::vector<double>& bcvalues)
     {
         if (state_ == Uninitialized) {
             throw std::runtime_error("Error in TPFAPressureSolver::assemble(): You must call init() prior to calling assemble().");