diff --git a/clang/lib/AST/ByteCode/Compiler.h b/clang/lib/AST/ByteCode/Compiler.h
index f34809cd0f14c..884ff9336de2b 100644
--- a/clang/lib/AST/ByteCode/Compiler.h
+++ b/clang/lib/AST/ByteCode/Compiler.h
@@ -115,8 +115,8 @@ enum class ScopeKind { Block, FullExpression, Call };
 
 /// Compilation context for expressions.
 template <class Emitter>
-class Compiler : public ConstStmtVisitor<Compiler<Emitter>, bool>,
-                 public Emitter {
+class Compiler final : public ConstStmtVisitor<Compiler<Emitter>, bool>,
+                       public Emitter {
 protected:
   // Aliases for types defined in the emitter.
   using LabelTy = typename Emitter::LabelTy;