--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/SpeculativeExecutionAttacksMitigations.java	Thu Oct 17 20:27:44 2019 +0100
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/SpeculativeExecutionAttacksMitigations.java	Thu Oct 17 20:53:35 2019 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,7 @@
 import org.graalvm.compiler.options.EnumOptionKey;
 import org.graalvm.compiler.options.Option;
 import org.graalvm.compiler.options.OptionKey;
+import org.graalvm.compiler.options.OptionStability;
 import org.graalvm.compiler.options.OptionType;
 
 public enum SpeculativeExecutionAttacksMitigations {
@@ -39,7 +40,7 @@
         // @formatter:off
         @Option(help = "file:doc-files/MitigateSpeculativeExecutionAttacksHelp.txt")
         public static final EnumOptionKey<SpeculativeExecutionAttacksMitigations> MitigateSpeculativeExecutionAttacks = new EnumOptionKey<>(None);
-        @Option(help = "Use index masking after bounds check to mitigate speculative execution attacks.", type = OptionType.User)
+        @Option(help = "Use index masking after bounds check to mitigate speculative execution attacks.", type = OptionType.User, stability = OptionStability.STABLE)
         public static final OptionKey<Boolean> UseIndexMasking = new OptionKey<>(false);
         // @formatter:on
     }