diff --git a/lib/webfuse_provider/impl/json/writer.c b/lib/webfuse_provider/impl/json/writer.c
index 9b151e4..ba809dd 100644
--- a/lib/webfuse_provider/impl/json/writer.c
+++ b/lib/webfuse_provider/impl/json/writer.c
@@ -71,7 +71,7 @@ wfp_impl_json_writer_reserve(
         }
 
         writer->raw_data = realloc(writer->raw_data, writer->pre + new_capacity);
-        writer->data = &(writer->data[writer->pre]);
+        writer->data = &(writer->raw_data[writer->pre]);
         writer->capacity = new_capacity;
     }
 }