diff --git a/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp b/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
index 06708da70..98aeefdf5 100644
--- a/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
+++ b/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
@@ -93,6 +93,11 @@ namespace Opm
         props_.viscosity(props_.numCells(), pressure, NULL, &allcells_[0], &visc_[0], NULL);
         props_.matrix(props_.numCells(), pressure, NULL, &allcells_[0], &A_[0], NULL);
 
+        // Check non-miscibility requirement (only done for first cell).
+        if (A_[1] != 0.0 || A_[2] != 0.0) {
+            THROW("TransportModelCompressibleTwophase requires a property object without miscibility.");
+        }
+
         std::vector<int> seq(grid_.number_of_cells);
         std::vector<int> comp(grid_.number_of_cells + 1);
         int ncomp;
diff --git a/opm/core/transport/reorder/TransportModelCompressibleTwophase.hpp b/opm/core/transport/reorder/TransportModelCompressibleTwophase.hpp
index 542363cd3..5b82ed624 100644
--- a/opm/core/transport/reorder/TransportModelCompressibleTwophase.hpp
+++ b/opm/core/transport/reorder/TransportModelCompressibleTwophase.hpp
@@ -30,6 +30,8 @@ namespace Opm
 
     class BlackoilPropertiesInterface;
 
+    /// Implements a reordering transport solver for compressible,
+    /// non-miscible two-phase flow.
     class TransportModelCompressibleTwophase : public TransportModelInterface
     {
     public: