diff --git a/mlir/include/mlir/IR/OperationSupport.h b/mlir/include/mlir/IR/OperationSupport.h
index ef5b8b178fbc7..f4cc5baa63355 100644
--- a/mlir/include/mlir/IR/OperationSupport.h
+++ b/mlir/include/mlir/IR/OperationSupport.h
@@ -693,9 +693,6 @@ class RegisteredOperationName : public OperationName {
   /// Return the dialect this operation is registered to.
   Dialect &getDialect() const { return *getImpl()->getDialect(); }
 
-  /// Use the specified object to parse this ops custom assembly format.
-  ParseResult parseAssembly(OpAsmParser &parser, OperationState &result) const;
-
   /// Represent the operation name as an opaque pointer. (Used to support
   /// PointerLikeTypeTraits).
   static RegisteredOperationName getFromOpaquePointer(const void *pointer) {