diff --git a/lib/modem-info.js b/lib/modem-info.js
index 6ae422f..11d2a46 100644
--- a/lib/modem-info.js
+++ b/lib/modem-info.js
@@ -22,6 +22,11 @@ const modemInfo = {
 };
 
 if (!config.disable_idle_check) {
+    const intervalBeetwenCheckMs = config.interval_beetwen_signal_strength_ms
+        || DEFAULT_INTERVAL_BETWEEN_IDLE_CHECK_MS;
+
+    logger.info('Registering idle / stuck modem background check', { intervalBeetwenCheckMs });
+
     setInterval(() => {
         const deltaMs = new Date() - Math.max(
             modemInfo.startTime,
@@ -33,7 +38,7 @@ if (!config.disable_idle_check) {
             logger.warn(`Modem idle for more than ${maxLastDataAgeMs} ms. Stucked modem? Terminating!`, { deltaMs });
             process.exit(1);
         }
-    }, config.interval_beetwen_signal_strength_ms || DEFAULT_INTERVAL_BETWEEN_IDLE_CHECK_MS);
+    }, intervalBeetwenCheckMs);
 } else {
     logger.info('Skip idle / stuck modem background check by config.disable_idle_check');
 }