diff --git a/package/kit-busrouter/files/usr/lib/busrouter/telemetry-synology.sh b/package/kit-busrouter/files/usr/lib/busrouter/telemetry-synology.sh
index b7c97b3..8d86ab5 100755
--- a/package/kit-busrouter/files/usr/lib/busrouter/telemetry-synology.sh
+++ b/package/kit-busrouter/files/usr/lib/busrouter/telemetry-synology.sh
@@ -207,6 +207,7 @@ _detect_wan_roles() {
 _aiwanbal_available() {
 	[ -d "$AIWANBAL_DIR" ] || return 1
 	_mtime=$(stat -c %Y "${AIWANBAL_DIR}/wan1_score_avg" 2>/dev/null || stat -f %m "${AIWANBAL_DIR}/wan1_score_avg" 2>/dev/null)
+	_mtime=$(printf '%s' "$_mtime" | tr -cd '0-9')
 	[ -n "$_mtime" ] || return 1
 	_now=$(date +%s)
 	_age=$(( _now - _mtime ))
@@ -415,6 +416,7 @@ _cached_speedtest() {
 	_f="${STATE_DIR}/speedtest-result-${_iface}"
 	[ -f "$_f" ] || return 1
 	_mtime=$(stat -c %Y "$_f" 2>/dev/null || stat -f %m "$_f" 2>/dev/null)
+	_mtime=$(printf '%s' "$_mtime" | tr -cd '0-9')
 	[ -n "$_mtime" ] || return 1
 	_st_now=$(date +%s)
 	_age=$(( _st_now - _mtime ))