diff --git a/shell/bot.sh b/shell/bot.sh
index ae795e5c..e455aa40 100644
--- a/shell/bot.sh
+++ b/shell/bot.sh
@@ -31,7 +31,7 @@ cp -f "$repo_path/jbot/requirements.txt" "$dir_root"
 cd $dir_root
 cat requirements.txt | while read LREAD
 do
-if test ! -z "$(pip3 show "${LREAD%%=*}" 1>/dev/null)"; then
+if [[ ! $(pip3 show "${LREAD%%=*}" 2>/dev/null) ]]; then
   pip3 --default-timeout=100 install ${LREAD}
 fi
 done