diff --git a/R-package/NAMESPACE b/R-package/NAMESPACE
index 8df060d28605..6b584567cc0a 100644
--- a/R-package/NAMESPACE
+++ b/R-package/NAMESPACE
@@ -19,20 +19,21 @@ export(lgb.Dataset.set.categorical)
 export(lgb.Dataset.set.reference)
 export(lgb.convert_with_rules)
 export(lgb.cv)
+export(lgb.drop_serialized)
 export(lgb.dump)
 export(lgb.get.eval.result)
 export(lgb.importance)
 export(lgb.interprete)
 export(lgb.load)
+export(lgb.make_serializable)
 export(lgb.model.dt.tree)
 export(lgb.plot.importance)
 export(lgb.plot.interpretation)
+export(lgb.restore_handle)
 export(lgb.save)
 export(lgb.train)
 export(lgb.unloader)
 export(lightgbm)
-export(readRDS.lgb.Booster)
-export(saveRDS.lgb.Booster)
 export(set_field)
 export(setinfo)
 export(slice)
diff --git a/R-package/R/lgb.Booster.R b/R-package/R/lgb.Booster.R
index 315542bbefd3..236d29b4d3fd 100644
--- a/R-package/R/lgb.Booster.R
+++ b/R-package/R/lgb.Booster.R
@@ -538,7 +538,7 @@ Booster <- R6::R6Class(
     # Store serialized raw bytes in model object
     save_raw = function() {
       if (is.null(self$raw))
-        self$raw <- self$save_model_to_string(NULL, as_char=FALSE)
+        self$raw <- self$save_model_to_string(NULL, as_char = FALSE)
       return(invisible(NULL))
 
     },