diff --git a/mlir/include/mlir/IR/Diagnostics.h b/mlir/include/mlir/IR/Diagnostics.h
--- a/mlir/include/mlir/IR/Diagnostics.h
+++ b/mlir/include/mlir/IR/Diagnostics.h
@@ -516,7 +516,7 @@
       : handlerID(0), ctx(ctx) {
     setHandler(std::forward<FuncTy>(handler));
   }
-  ~ScopedDiagnosticHandler();
+  virtual ~ScopedDiagnosticHandler();
 
 protected:
   /// Set the handler to manage via RAII.