diff --git a/ESPtermostat.ino b/ESPtermostat.ino
index d0fd84e..b7136d3 100644
--- a/ESPtermostat.ino
+++ b/ESPtermostat.ino
@@ -185,7 +185,7 @@ void readSensors() {
 
   for (uint8_t i = 0; i < ds18Count; i++) {
     sensor.getAddress(addr, i);
-    deviceAddress[savedTemperatures] == "";
+    deviceAddress[savedTemperatures] = "";
     for (uint8_t n = 0; n < 8; n++) {
       if (addr[n] < 16) {
         deviceAddress[savedTemperatures] += String(0, HEX);