diff --git a/src/code_matcher.ml b/src/code_matcher.ml
index c80afea6..a33c408b 100644
--- a/src/code_matcher.ml
+++ b/src/code_matcher.ml
@@ -187,9 +187,23 @@ struct
           mismatch_handler loc [ x ]);
         match_loop ~end_pos ~mismatch_handler ~expected ~source
 
+  (* [source] is supposed to be the list of items that follow the [@@deriving_inline]
+     item in the source file. That is not the case when the [@@deriving_inline] item is
+     itself part of code generated by another ppx: the generator is free to insert items
+     of its own after it.
+
+     Such items have no corresponding source text; their location is inherited from the
+     node they were generated from, and hence starts at or before the start of the
+     [@@deriving_inline] item. Were we to keep them, we would end up replacing the
+     source text of the [@@deriving_inline] item itself with the generated code. *)
+  let drop_items_without_source_text ~pos items =
+    List.filter items ~f:(fun item ->
+        Location.compare_pos (M.get_loc item).loc_start pos >= 0)
+
   let do_match ~pos ~expected ~mismatch_handler source =
     let open Result in
     extract_prefix ~pos source >>| fun (source, end_pos) ->
+    let source = drop_items_without_source_text ~pos source in
     match_loop ~end_pos ~mismatch_handler ~expected ~source
 end