Index: clang/lib/Analysis/FlowSensitive/Models/UncheckedOptionalAccessModel.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/Models/UncheckedOptionalAccessModel.cpp
+++ clang/lib/Analysis/FlowSensitive/Models/UncheckedOptionalAccessModel.cpp
@@ -50,7 +50,8 @@
 
   if (RD.getName() == "optional") {
     if (const auto *N = dyn_cast_or_null<NamespaceDecl>(RD.getDeclContext()))
-      return N->isStdNamespace() || isTopLevelNamespaceWithName(*N, "absl");
+      return N->isStdNamespace() || isTopLevelNamespaceWithName(*N, "absl") ||
+             isTopLevelNamespaceWithName(*N, "boost");
     return false;
   }