diff --git a/src/client/libdistren.h b/src/client/libdistren.h
--- a/src/client/libdistren.h
+++ b/src/client/libdistren.h
@@ -72,7 +72,11 @@ struct distren
   /* something on which to call multiio_poll() ;-) */
   multiio_context_t multiio;
 
-  
+  /*
+   * The last-used per-connection DISTREN_REQUEST_FILE_POST
+   * identifier.
+   */
+  uint32_t file_post_id;
 };
 
 struct distren_job