diff --git a/opm/simulators/flow/MissingFeatures.cpp b/opm/simulators/flow/MissingFeatures.cpp
index 23f127fd40..99ecf7eacd 100644
--- a/opm/simulators/flow/MissingFeatures.cpp
+++ b/opm/simulators/flow/MissingFeatures.cpp
@@ -85,7 +85,6 @@ namespace MissingFeatures {
             "ACTIONG",
             "ACTIONR",
             "ACTIONW",
-            "ACTIONX",
             "ACTPARAM",
             "ADSALNOD",
             "ADDZCORN",