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dumux/material/eos/pengrobinson.hh

@@ -181,7 +181,7 @@ public:
         // would get negative molar volumes for the liquid phase, we
         // consider the liquid phase non-existant.)
         // Note that invertCubicPolynomial sorts the roots in ascending order
-        if (numSol > 1 && Z[0] <= 0) {
+        if (numSol > 1 && Z[0] <= 0.0) {
             Z[0] = Z[numSol - 1];
             numSol = 1;
         }