diff --git a/source/_integrations/mhz19.markdown b/source/_integrations/mhz19.markdown
index 640da7dfd26..e5e3765f1ca 100644
--- a/source/_integrations/mhz19.markdown
+++ b/source/_integrations/mhz19.markdown
@@ -53,7 +53,7 @@ enable_uart=1
 Then (after a reboot): you can setup the sensor using:
 
 ```yaml
-  serial_device: /dev/tty.S0
+  serial_device: /dev/ttyS0
 ```
 
 ## Calibration