diff --git a/mlir/include/mlir/IR/MLIRContext.h b/mlir/include/mlir/IR/MLIRContext.h
--- a/mlir/include/mlir/IR/MLIRContext.h
+++ b/mlir/include/mlir/IR/MLIRContext.h
@@ -156,9 +156,6 @@
   void enterMultiThreadedExecution();
   void exitMultiThreadedExecution();
 
-private:
-  const std::unique_ptr<MLIRContextImpl> impl;
-
   /// Get a dialect for the provided namespace and TypeID: abort the program if
   /// a dialect exist for this namespace with different TypeID. If a dialect has
   /// not been loaded for this namespace/TypeID yet, use the provided ctor to
@@ -167,6 +164,9 @@
   Dialect *getOrLoadDialect(StringRef dialectNamespace, TypeID dialectID,
                             function_ref<std::unique_ptr<Dialect>()> ctor);
 
+private:
+  const std::unique_ptr<MLIRContextImpl> impl;
+
   MLIRContext(const MLIRContext &) = delete;
   void operator=(const MLIRContext &) = delete;
 };