diff --git a/MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp b/MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp
index 9cabb0beec373e20fcabd3232be41451c3e35dbb..b9b0f89539e2e6e0946e223883e7dc65eb60c98a 100644
--- a/MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp
+++ b/MaterialLib/MPL/Properties/CreateRelPermBrooksCorey.cpp
@@ -36,7 +36,7 @@ std::unique_ptr<RelPermBrooksCorey> createRelPermBrooksCorey(
     auto const exponent =
         //! \ogs_file_param{prj__media__medium__properties__property__RelPermBrooksCorey__lambda}
         config.getConfigParameter<double>("lambda");
-    if (exponent == 0.)
+    if (exponent <= 0.)
     {
         OGS_FATAL("Exponent 'lambda' must be positive.");
     }
diff --git a/MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp b/MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp
index a2a22c507331d001decf645e5b79cfa642d7f050..6ff47331871b9777a3ca78f7023e4973622fef5b 100644
--- a/MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp
+++ b/MaterialLib/MPL/Properties/RelPermBrooksCorey.cpp
@@ -26,7 +26,6 @@ RelPermBrooksCorey::RelPermBrooksCorey(
     const double min_relative_permeability_liquid,
     const double min_relative_permeability_gas,
     const double exponent)
-
     : _residual_liquid_saturation(residual_liquid_saturation),
       _residual_gas_saturation(residual_gas_saturation),
       _min_relative_permeability_liquid(min_relative_permeability_liquid),
diff --git a/MaterialLib/MPL/Properties/RelPermBrooksCorey.h b/MaterialLib/MPL/Properties/RelPermBrooksCorey.h
index 0f18e81292ed6d40e49fefa0e1a1bee278a6eeee..a387ac129a5c78a0dbc15c0fc21f807d3d0d57d3 100644
--- a/MaterialLib/MPL/Properties/RelPermBrooksCorey.h
+++ b/MaterialLib/MPL/Properties/RelPermBrooksCorey.h
@@ -45,7 +45,7 @@ public:
                        const double /*_min_relative_permeability_gas*/,
                        const double /*exponent*/
     );
-    /// This method assigns a pointer to the meterial object that is the owner
+    /// This method assigns a pointer to the material object that is the owner
     /// of this property
     void setScale(
         std::variant<Medium*, Phase*, Component*> scale_pointer) override