diff --git a/opm/core/props/satfunc/SatFuncSimple.cpp b/opm/core/props/satfunc/SatFuncSimple.cpp
index 940f12de..83a377ff 100644
--- a/opm/core/props/satfunc/SatFuncSimple.cpp
+++ b/opm/core/props/satfunc/SatFuncSimple.cpp
@@ -36,7 +36,7 @@ namespace Opm
     void SatFuncBase<NonuniformTableLinear<double> >::initializeTableType(NonuniformTableLinear<double> & table,
                                                                            const std::vector<double>& arg,
                                                                            const std::vector<double>& value,
-                                                                           const int samples)
+                                                                          const int /*samples*/)
     {
       table = NonuniformTableLinear<double>(arg, value);
     }
@@ -84,7 +84,7 @@ namespace Opm
         }
     }
 
-    double EPSTransforms::Transform::scaleSatDeriv(double s, double s_r, double s_cr, double s_max) const
+    double EPSTransforms::Transform::scaleSatDeriv(double s, double /*s_r*/, double /*s_cr*/, double /*s_max*/) const
     {
         if (doNotScale) {
             return 1.0;
diff --git a/opm/core/utility/Spline.hpp b/opm/core/utility/Spline.hpp
index 4442b77b..835caf23 100644
--- a/opm/core/utility/Spline.hpp
+++ b/opm/core/utility/Spline.hpp
@@ -945,6 +945,7 @@ public:
 
         int r = 3;
         if (x0 < xMin()) {
+            static_cast<void>(extrapolate);
             assert(extrapolate);
             Scalar m = evalDerivative_(xMin(), /*segmentIdx=*/0);
             if (std::abs(m) < 1e-20)
@@ -1575,16 +1576,16 @@ protected:
     { return 2*3*t - 2; }
 
     // third derivative of the hermite basis functions
-    Scalar h00_prime3_(Scalar t) const
+    Scalar h00_prime3_(Scalar /*t*/) const
     { return 2*3*2; }
 
-    Scalar h10_prime3_(Scalar t) const
+    Scalar h10_prime3_(Scalar /*t*/) const
     { return 2*3; }
 
-    Scalar h01_prime3_(Scalar t) const
+    Scalar h01_prime3_(Scalar /*t*/) const
     { return -2*3*2; }
 
-    Scalar h11_prime3_(Scalar t) const
+    Scalar h11_prime3_(Scalar /*t*/) const
     { return 2*3; }
 
     // returns the monotonicality of an interval of a spline segment