diff --git a/opm/simulators/utils/PartiallySupportedFlowKeywords.cpp b/opm/simulators/utils/PartiallySupportedFlowKeywords.cpp
index c9d3e6b78..d79d2ed54 100644
--- a/opm/simulators/utils/PartiallySupportedFlowKeywords.cpp
+++ b/opm/simulators/utils/PartiallySupportedFlowKeywords.cpp
@@ -368,7 +368,7 @@ partiallySupported()
          {
             "EHYSTR",
             {
-               {2,{true, allow_values<int> {0, 1, 2, 3}, "EHYSTR(HYSTMOD): only Carlson or Killough Hysteresis Models supported (0,1 or 2,3)"}}, // relative_perm_hyst
+               {2,{true, allow_values<int> {0, 1, 2, 3, 4}, "EHYSTR(HYSTMOD): only Carlson or Killough Hysteresis Models supported (0,1 or 2,3)"}}, // relative_perm_hyst
                {13,{true, allow_values<int> {0}, "EHYSTR(HYSWETRP): Killough’s option not supported and should be defaulted"}}, // FLAG_SOMETHING
             },
          },