diff --git a/examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino b/examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino
index 993ceb7..53d6b5e 100644
--- a/examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino
+++ b/examples/C02_PM_SHT_OLED_WIFI/C02_PM_SHT_OLED_WIFI.ino
@@ -39,6 +39,8 @@ AirGradient ag = AirGradient();
 
 SSD1306Wire display(0x3c, SDA, SCL);
 
+WiFiClient client;
+
 // set sensors that you do not use to false
 boolean hasPM=true;
 boolean hasCO2=true;