diff --git a/src/api/types.rs b/src/api/types.rs
index 1548d42..c6466c9 100644
--- a/src/api/types.rs
+++ b/src/api/types.rs
@@ -397,6 +397,12 @@ impl Time {
 #[derive(Debug, Clone, Hash, PartialEq, Eq, Serialize, Deserialize)]
 pub struct UserId(pub String);
 
+impl fmt::Display for UserId {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 #[derive(Debug, PartialEq, Eq)]
 pub enum SessionType {
     Agent,