diff --git a/opm/autodiff/StandardWell_impl.hpp b/opm/autodiff/StandardWell_impl.hpp
index a99451e4a..c3f50c022 100644
--- a/opm/autodiff/StandardWell_impl.hpp
+++ b/opm/autodiff/StandardWell_impl.hpp
@@ -331,7 +331,7 @@ namespace Opm
             return primary_variables_evaluation_[GFrac];
         }
 
-        if (has_solvent && compIdx == contiSolventEqIdx) {
+        if (has_solvent && compIdx == (unsigned)contiSolventEqIdx) {
             return primary_variables_evaluation_[SFrac];
         }
 
diff --git a/opm/core/simulator/SimulatorReport.hpp b/opm/core/simulator/SimulatorReport.hpp
index 696f9bca1..e86f4e7ef 100644
--- a/opm/core/simulator/SimulatorReport.hpp
+++ b/opm/core/simulator/SimulatorReport.hpp
@@ -45,7 +45,7 @@ namespace Opm
         bool converged;
 
         /// Default constructor initializing all times to 0.0.
-        SimulatorReport(bool verbose=true);
+        explicit SimulatorReport(bool verbose=true);
         /// Copy constructor
         SimulatorReport(const SimulatorReport&) = default;
         /// Increment this report's times by those in sr.
diff --git a/opm/core/transport/reorder/reordersequence.cpp b/opm/core/transport/reorder/reordersequence.cpp
index 2efc478a8..08446c3c1 100644
--- a/opm/core/transport/reorder/reordersequence.cpp
+++ b/opm/core/transport/reorder/reordersequence.cpp
@@ -18,7 +18,7 @@
 
 struct SortByAbsFlux
 {
-    SortByAbsFlux(const double* flux)
+    explicit SortByAbsFlux(const double* flux)
         : flux_(flux)
     {}
     bool operator() (int f1, int f2)
diff --git a/opm/core/utility/miscUtilitiesBlackoil.cpp b/opm/core/utility/miscUtilitiesBlackoil.cpp
index 14e1cbf69..82960dca3 100644
--- a/opm/core/utility/miscUtilitiesBlackoil.cpp
+++ b/opm/core/utility/miscUtilitiesBlackoil.cpp
@@ -318,7 +318,6 @@ namespace Opm
 
 
         //double res_vol;
-        double tot_sat;
         const double epsilon = std::sqrt(std::numeric_limits<double>::epsilon());
 
         for (int c = 0; c < nc; ++c) {
@@ -332,7 +331,7 @@ namespace Opm
 
             dgesv_(&n, &nrhs, &A[0], &lda, &piv[0], &s[0], &ldb, &info);
 
-            tot_sat = 0;
+            double tot_sat = 0;
             for (int p = 0; p < np; ++p){
                 if (s[p] < epsilon) // saturation may be less then zero due to round of errors
                     s[p] = 0;
diff --git a/opm/polymer/PolymerProperties.cpp b/opm/polymer/PolymerProperties.cpp
index 6a29e6089..3c72a2e3a 100644
--- a/opm/polymer/PolymerProperties.cpp
+++ b/opm/polymer/PolymerProperties.cpp
@@ -197,7 +197,7 @@ namespace Opm
         mu_w_eff = 1./mu_w_eff;
     }
 
-    void PolymerProperties::effectiveViscWithDer(const double c, const double mu_w, double& mu_w_eff, double dmu_w_eff_dc) const {
+    void PolymerProperties::effectiveViscWithDer(const double c, const double mu_w, double& mu_w_eff, double& dmu_w_eff_dc) const {
         effectiveInvViscWithDer(c, mu_w, mu_w_eff, dmu_w_eff_dc);
         mu_w_eff = 1./mu_w_eff;
         dmu_w_eff_dc = -dmu_w_eff_dc*mu_w_eff*mu_w_eff;
diff --git a/opm/polymer/PolymerProperties.hpp b/opm/polymer/PolymerProperties.hpp
index 4553581ae..7961ab1c0 100644
--- a/opm/polymer/PolymerProperties.hpp
+++ b/opm/polymer/PolymerProperties.hpp
@@ -283,7 +283,7 @@ namespace Opm
 
         void effectiveViscWithDer(const double c, const double visc
                                                      , double& mu_w_eff
-                                                     , double dmu_w_eff_dc) const;
+                                                     , double& dmu_w_eff_dc) const;
 
         void effectiveInvVisc(const double c, const double mu_w,
                                                  double& inv_mu_w_eff) const;
diff --git a/opm/polymer/TransportSolverTwophaseCompressiblePolymer.cpp b/opm/polymer/TransportSolverTwophaseCompressiblePolymer.cpp
index fad703c63..b876e9219 100644
--- a/opm/polymer/TransportSolverTwophaseCompressiblePolymer.cpp
+++ b/opm/polymer/TransportSolverTwophaseCompressiblePolymer.cpp
@@ -306,7 +306,7 @@ namespace Opm
         mutable double s; // Mutable in order to change it with every operator() call to be the last computed s value.
         TransportSolverTwophaseCompressiblePolymer::ResidualEquation& res_eq_;
         explicit ResidualC(TransportSolverTwophaseCompressiblePolymer::ResidualEquation& res_eq)
-            : res_eq_(res_eq)
+            : s(0.0), res_eq_(res_eq)
         {}
 
         void computeBothResiduals(const double s_arg, const double c_arg, double& res_s, double& res_c, double& mc, double& ff) const
diff --git a/tutorials/sim_tutorial1.cpp b/tutorials/sim_tutorial1.cpp
index 193826403..eabd41e26 100644
--- a/tutorials/sim_tutorial1.cpp
+++ b/tutorials/sim_tutorial1.cpp
@@ -87,7 +87,9 @@ try
     /// We open an output file stream for the output
     /// \snippet tutorial1.cpp output stream
     /// \internal [output stream]
+#ifdef DISABLE_OUTPUT
     std::ofstream vtkfile("tutorial1.vtu");
+#endif
     /// \internal [output stream]
     /// \endinternal
     /// \page tutorial1