diff --git a/opm/polymer/TransportModelPolymer.cpp b/opm/polymer/TransportModelPolymer.cpp
index 779755b14..3b7b93f1d 100644
--- a/opm/polymer/TransportModelPolymer.cpp
+++ b/opm/polymer/TransportModelPolymer.cpp
@@ -828,7 +828,7 @@ namespace Opm
     void TransportModelPolymer::fracFlow(double s, double c, double cmax,
                                          int cell, double& ff) const
     {
-        double* dummy;
+        double dummy[2];
         fracFlowBoth(s, c, cmax, cell, ff,  dummy, false);
     }
 
diff --git a/opm/polymer/polymerUtilities.cpp b/opm/polymer/polymerUtilities.cpp
index 659780074..0a1a97129 100644
--- a/opm/polymer/polymerUtilities.cpp
+++ b/opm/polymer/polymerUtilities.cpp
@@ -79,7 +79,7 @@ namespace Opm
 	props.relperm(num_cells, &s[0], &cells[0], &kr[0], 0);
 	const double* visc = props.viscosity();
 	const double* rho = props.density();
-        double mob[num_phases]; // here we assume num_phases=2
+        double mob[2]; // here we assume num_phases=2
 	for (int cell = 0; cell < num_cells; ++cell) {
             double*  kr_cell = &kr[2*cell];
             polyprops.effectiveMobilities(c[cell], cmax[cell], visc, kr_cell,
@@ -132,7 +132,7 @@ namespace Opm
         polyprod = 0.0;
         const double* visc = props.viscosity();
         std::vector<double> kr_cell(np);
-        double mob[np];
+        double mob[2];
         for (int cell = 0; cell < num_cells; ++cell) {
             if (src[cell] > 0.0) {
                 injected[0] += src[cell]*dt;