diff --git a/sdk/lib/ffi/struct.dart b/sdk/lib/ffi/struct.dart
index 0a65119..bf8ded9 100644
--- a/sdk/lib/ffi/struct.dart
+++ b/sdk/lib/ffi/struct.dart
@@ -62,5 +62,6 @@
 /// Extension on [Struct] specialized for its subtypes.
 extension StructAddressOf<T extends Struct> on T {
   /// Returns the address backing the reference.
+  @Deprecated('Hold on to the pointer backing a struct instead.')
   Pointer<T> get addressOf => _addressOf as Pointer<T>;
 }