diff --git a/scripts/_common.sh b/scripts/_common.sh
index cc8c7fe..9c2d489 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -49,15 +49,16 @@ install_source() {
         test -e $final_path/bin/python3 || python3 -m venv $final_path
 
 # 		Install pgadmin in virtualenv
-        set +u;
+        u_arg='u'
+        set +$u_arg;
         source $final_path/bin/activate
         set -u;
         pip3 install --upgrade pip
         pip3 install --upgrade 'Werkzeug<1.0'
         pip3 install --upgrade pgadmin$app_main_version==$app_sub_version
-        set +u;
+        set +$u_arg;
         deactivate
-        set -u;
+        set -$u_arg;
     fi
 }