diff --git a/src/api/client/keys.rs b/src/api/client/keys.rs
index 650c573f..c66e9244 100644
--- a/src/api/client/keys.rs
+++ b/src/api/client/keys.rs
@@ -75,7 +75,8 @@ pub(crate) async fn upload_keys_route(
 		}
 		if deser_device_keys.device_id != sender_device {
 			return Err!(Request(Unknown(
-				"Device ID in keys uploaded does not match your own device ID"
+				"Device ID in keys uploaded ({}) does not match your own device ID ({})",
+				deser_device_keys.device_id, sender_device,
 			)));
 		}