diff --git a/x-ui.sh b/x-ui.sh
index b5fe59470..f36ba40a1 100755
--- a/x-ui.sh
+++ b/x-ui.sh
@@ -191,7 +191,7 @@ if [ ! -z "$TEST_HOME" ]; then
     mkdir -p "$TEST_HOME"
 fi
 
-unset E_RESTART E_START E_IPC_SOCKET E_START_TIME E_CONF_PROFILE
+unset E_RESTART E_START E_IPC_SOCKET E_START_TIME E_CONF_PROFILE E_PREFIX
 
 if [ $VERBOSE -ne 0 ]; then
     cat <<EOF