diff --git a/crates/ruma-client-api/src/uiaa.rs b/crates/ruma-client-api/src/uiaa.rs
index d07d36cb..9aced0e5 100644
--- a/crates/ruma-client-api/src/uiaa.rs
+++ b/crates/ruma-client-api/src/uiaa.rs
@@ -34,9 +34,9 @@ mod user_serde;
 ///
 /// To construct the custom `AuthData` variant you first have to construct [`IncomingAuthData::new`]
 /// and then call [`IncomingAuthData::to_outgoing`] on it.
-#[derive(Clone, Debug, Incoming, Serialize)]
+#[derive(Clone, Incoming, Serialize)]
 #[non_exhaustive]
-#[incoming_derive(!Deserialize)]
+#[incoming_derive(!Debug, !Deserialize)]
 #[serde(untagged)]
 pub enum AuthData<'a> {
     /// Password-based authentication (`m.login.password`).
@@ -140,6 +140,22 @@ impl<'a> AuthData<'a> {
     }
 }
 
+impl fmt::Debug for AuthData<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // Print `Password { .. }` instead of `Password(Password { .. })`
+        match self {
+            Self::Password(inner) => inner.fmt(f),
+            Self::ReCaptcha(inner) => inner.fmt(f),
+            Self::EmailIdentity(inner) => inner.fmt(f),
+            Self::Msisdn(inner) => inner.fmt(f),
+            Self::Dummy(inner) => inner.fmt(f),
+            Self::RegistrationToken(inner) => inner.fmt(f),
+            Self::FallbackAcknowledgement(inner) => inner.fmt(f),
+            Self::_Custom(inner) => inner.fmt(f),
+        }
+    }
+}
+
 impl IncomingAuthData {
     /// Creates a new `IncomingAuthData` with the given `auth_type` string, session and data.
     ///
@@ -269,6 +285,22 @@ impl IncomingAuthData {
     }
 }
 
+impl fmt::Debug for IncomingAuthData {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        // Print `Password { .. }` instead of `Password(Password { .. })`
+        match self {
+            Self::Password(inner) => inner.fmt(f),
+            Self::ReCaptcha(inner) => inner.fmt(f),
+            Self::EmailIdentity(inner) => inner.fmt(f),
+            Self::Msisdn(inner) => inner.fmt(f),
+            Self::Dummy(inner) => inner.fmt(f),
+            Self::RegistrationToken(inner) => inner.fmt(f),
+            Self::FallbackAcknowledgement(inner) => inner.fmt(f),
+            Self::_Custom(inner) => inner.fmt(f),
+        }
+    }
+}
+
 impl<'de> Deserialize<'de> for IncomingAuthData {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where