diff --git a/opm/simulators/utils/UnsupportedFlowKeywords.cpp b/opm/simulators/utils/UnsupportedFlowKeywords.cpp
index 9a7348469..32e280cc6 100644
--- a/opm/simulators/utils/UnsupportedFlowKeywords.cpp
+++ b/opm/simulators/utils/UnsupportedFlowKeywords.cpp
@@ -324,7 +324,6 @@ const KeywordValidation::UnsupportedKeywords& unsupportedKeywords()
         {"IONXSURF", {false, std::nullopt}},
         {"ISOLNUM", {false, std::nullopt}},
         {"JFUNCR", {false, std::nullopt}},
-        {"KRNUM", {false, std::nullopt}},
         {"KRNUMMF", {false, std::nullopt}},
         {"LANGMPL", {false, std::nullopt}},
         {"LANGMUIR", {false, std::nullopt}},