diff --git a/opm/simulators/utils/UnsupportedFlowKeywords.cpp b/opm/simulators/utils/UnsupportedFlowKeywords.cpp
index 7c3a1229c6..657ee86cc9 100644
--- a/opm/simulators/utils/UnsupportedFlowKeywords.cpp
+++ b/opm/simulators/utils/UnsupportedFlowKeywords.cpp
@@ -484,6 +484,7 @@ const KeywordValidation::UnsupportedKeywords& unsupportedKeywords()
         {"PLYATEMP", {true, std::nullopt}},
         {"PLYCAMAX", {true, std::nullopt}},
         {"PLYDHFLF", {true, std::nullopt}},
+        {"PLYSHEAR", {true, std::nullopt}},
         {"PRORDER", {true, std::nullopt}},
         {"PRVD", {true, std::nullopt}},
         {"PVTGWO", {true, std::nullopt}},