diff --git a/crates/ruma-common/src/to_device.rs b/crates/ruma-common/src/to_device.rs
index 59aa6705..48862dac 100644
--- a/crates/ruma-common/src/to_device.rs
+++ b/crates/ruma-common/src/to_device.rs
@@ -27,7 +27,7 @@ pub enum DeviceIdOrAllDevices {
 impl Display for DeviceIdOrAllDevices {
     fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
         match self {
-            DeviceIdOrAllDevices::DeviceId(device_id) => write!(f, "{}", device_id.to_string()),
+            DeviceIdOrAllDevices::DeviceId(device_id) => write!(f, "{}", device_id),
             DeviceIdOrAllDevices::AllDevices => write!(f, "*"),
         }
     }