diff --git a/mlir/include/mlir/IR/DialectRegistry.h b/mlir/include/mlir/IR/DialectRegistry.h
index d3d53488fe72d..7bcf1eda7c636 100644
--- a/mlir/include/mlir/IR/DialectRegistry.h
+++ b/mlir/include/mlir/IR/DialectRegistry.h
@@ -143,6 +143,8 @@ class DialectRegistry {
 
 public:
   explicit DialectRegistry();
+  DialectRegistry(const DialectRegistry &) = delete;
+  DialectRegistry &operator=(const DialectRegistry &other) = delete;
 
   template <typename ConcreteDialect>
   void insert() {
diff --git a/mlir/include/mlir/IR/OperationSupport.h b/mlir/include/mlir/IR/OperationSupport.h
index 2d9fb2bc5859e..0046d977c68f4 100644
--- a/mlir/include/mlir/IR/OperationSupport.h
+++ b/mlir/include/mlir/IR/OperationSupport.h
@@ -985,9 +985,9 @@ struct OperationState {
                  BlockRange successors = {},
                  MutableArrayRef<std::unique_ptr<Region>> regions = {});
   OperationState(OperationState &&other) = default;
-  OperationState(const OperationState &other) = default;
   OperationState &operator=(OperationState &&other) = default;
-  OperationState &operator=(const OperationState &other) = default;
+  OperationState(const OperationState &other) = delete;
+  OperationState &operator=(const OperationState &other) = delete;
   ~OperationState();
 
   /// Get (or create) a properties of the provided type to be set on the