diff --git a/sketch/application.cpp b/sketch/application.cpp
index 9686df3..1da9e94 100644
--- a/sketch/application.cpp
+++ b/sketch/application.cpp
@@ -90,7 +90,7 @@ void loopApplication() {
 #ifdef DEBUG
     Serial.println("Sleeping");
 #endif
-    client.disconnect();
+    mqttClient.disconnect();
     ESP.deepSleep(configBlock.measurePeriod * 1000000);
 #endif
   }