diff --git a/cmd/trace.go b/cmd/trace.go
index 0c67775..2bd47ff 100644
--- a/cmd/trace.go
+++ b/cmd/trace.go
@@ -31,6 +31,9 @@ func init() {
 	traceCmd := &cobra.Command{
 		Use:   "trace",
 		Short: "To trace traffic",
+		PreRun: func(cmd *cobra.Command, args []string) {
+			trace.ReadKallsyms()
+		},
 		Run: func(cmd *cobra.Command, args []string) {
 			internal.AutoSu()
 
diff --git a/trace/kallsyms.go b/trace/kallsyms.go
index aa575d9..c920cb8 100644
--- a/trace/kallsyms.go
+++ b/trace/kallsyms.go
@@ -26,11 +26,7 @@ var kallsyms []Symbol
 var kallsymsByName map[string]Symbol = make(map[string]Symbol)
 var kallsymsByAddr map[uint64]Symbol = make(map[uint64]Symbol)
 
-func init() {
-	readKallsyms()
-}
-
-func readKallsyms() {
+func ReadKallsyms() {
 	file, err := os.Open("/proc/kallsyms")
 	if err != nil {
 		logrus.Fatalf("failed to open /proc/kallsyms: %v", err)