diff --git a/opm/core/props/satfunc/SaturationPropsFromDeck_impl.hpp b/opm/core/props/satfunc/SaturationPropsFromDeck_impl.hpp
index c85cef78c..a6e699faf 100644
--- a/opm/core/props/satfunc/SaturationPropsFromDeck_impl.hpp
+++ b/opm/core/props/satfunc/SaturationPropsFromDeck_impl.hpp
@@ -212,7 +212,7 @@ namespace Opm
                           "SaturationPropsFromDeck::init()   --  ENDSCALE: "
                           "Currently only 'NODIR' accepted.");
             }
-            if (endscale.isReversible()) {
+            if (!endscale.isReversible()) {
                 OPM_THROW(std::runtime_error,
                           "SaturationPropsFromDeck::init()   --  ENDSCALE: "
                           "Currently only 'REVERS' accepted.");