diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index 8f14f714b..02ea25524 100755
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -1939,8 +1939,8 @@ void MqttShowState(void)
   ResponseAppend_P(PSTR(",\"" D_JSON_VCC "\":%s"), stemp1);
 #endif
 
-  ResponseAppend_P(PSTR(",\"SleepMode\":\"%s\",\"Sleep\":%u,\"LoadAvg\":%u"),
-    GetTextIndexed(stemp1, sizeof(stemp1), Settings.flag3.sleep_normal, kSleepMode), sleep, loop_load_avg);
+  ResponseAppend_P(PSTR(",\"" D_JSON_HEAPSIZE "\":%d,\"SleepMode\":\"%s\",\"Sleep\":%u,\"LoadAvg\":%u"),
+    ESP.getFreeHeap()/1024, GetTextIndexed(stemp1, sizeof(stemp1), Settings.flag3.sleep_normal, kSleepMode), sleep, loop_load_avg);
 
   for (uint32_t i = 0; i < devices_present; i++) {
 #ifdef USE_LIGHT