diff --git a/crates/ruma-client-api/src/r0/uiaa.rs b/crates/ruma-client-api/src/r0/uiaa.rs
index b6717eba..0a4b6ad4 100644
--- a/crates/ruma-client-api/src/r0/uiaa.rs
+++ b/crates/ruma-client-api/src/r0/uiaa.rs
@@ -524,7 +524,7 @@ impl IncomingOAuth2 {
 pub struct EmailIdentity<'a> {
     /// Thirdparty identifier credentials.
     #[cfg_attr(not(feature = "compat"), serde(rename = "threepidCreds"))]
-    #[cfg_attr(feature = "compat", rename = "threepid_creds", alias = "threepidCreds")]
+    #[cfg_attr(feature = "compat", serde(rename = "threepid_creds", alias = "threepidCreds"))]
     pub thirdparty_id_creds: &'a [ThirdpartyIdCredentials],
 
     /// The value of the session key given by the homeserver, if any.
@@ -552,7 +552,7 @@ impl IncomingEmailIdentity {
 pub struct Msisdn<'a> {
     /// Thirdparty identifier credentials.
     #[cfg_attr(not(feature = "compat"), serde(rename = "threepidCreds"))]
-    #[cfg_attr(feature = "compat", rename = "threepid_creds", alias = "threepidCreds")]
+    #[cfg_attr(feature = "compat", serde(rename = "threepid_creds", alias = "threepidCreds"))]
     pub thirdparty_id_creds: &'a [ThirdpartyIdCredentials],
 
     /// The value of the session key given by the homeserver, if any.