diff --git a/Sources/ApolloCodegenLib/Templates/SelectionSetTemplate.swift b/Sources/ApolloCodegenLib/Templates/SelectionSetTemplate.swift
index 686c22a0f..85b5f1174 100644
--- a/Sources/ApolloCodegenLib/Templates/SelectionSetTemplate.swift
+++ b/Sources/ApolloCodegenLib/Templates/SelectionSetTemplate.swift
@@ -559,8 +559,6 @@ struct SelectionSetTemplate {
             "if let newData = f?.__data { __data = newData }",
           else: "__data = f.__data"
         ) }
-        @available(*, unavailable, message: "mutate properties of the fragment instead.")
-        set { preconditionFailure() }
       }
       """,
         else: " _toFragment() }"