diff --git a/R-package/NAMESPACE b/R-package/NAMESPACE
index a20057e25..f2baee12b 100644
--- a/R-package/NAMESPACE
+++ b/R-package/NAMESPACE
@@ -24,6 +24,8 @@ importFrom(data.table,data.table)
 importFrom(data.table,rbindlist)
 importFrom(data.table,set)
 importFrom(magrittr,"%>%")
+importFrom(magrittr,add)
+importFrom(magrittr,not)
 importFrom(stringr,str_extract)
 importFrom(stringr,str_extract_all)
 importFrom(stringr,str_match)
diff --git a/R-package/R/xgb.plot.tree.R b/R-package/R/xgb.plot.tree.R
index 7770bff1a..7eb267298 100644
--- a/R-package/R/xgb.plot.tree.R
+++ b/R-package/R/xgb.plot.tree.R
@@ -7,6 +7,8 @@
 #' @importFrom data.table set
 #' @importFrom data.table rbindlist
 #' @importFrom magrittr %>%
+#' @importFrom magrittr not
+#' @importFrom magrittr add
 #' @importFrom data.table :=
 #' @importFrom stringr str_extract
 #' @importFrom stringr str_split