diff --git a/src/sensors/mod.rs b/src/sensors/mod.rs
index 8637b13..d92c8c7 100644
--- a/src/sensors/mod.rs
+++ b/src/sensors/mod.rs
@@ -47,6 +47,8 @@ pub struct SensorMetadata {
     pub location: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub description: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub lastchange: Option<u64>,
 }
 
 /// Common information describing any sensor which requires a specified location.