diff --git a/r.scripts/sc_DEG.R b/r.scripts/sc_DEG.R
index 983329f4664bb35db33f5d06556032940a56d365..4ebcc01f619649397c04fe34d682785469c562e9 100755
--- a/r.scripts/sc_DEG.R
+++ b/r.scripts/sc_DEG.R
@@ -3,6 +3,7 @@ gc()
 library(methods)
 library(optparse)
 library(Seurat)
+library(readr)
 
 #retrive command line options
 option_list=list(