diff --git a/rust-sdk/Cargo.toml b/rust-sdk/Cargo.toml
index f5a2e20e3c..ee9a950ed0 100644
--- a/rust-sdk/Cargo.toml
+++ b/rust-sdk/Cargo.toml
@@ -37,7 +37,7 @@ features = ["rt-multi-thread"]
 [dependencies.uniffi]
 version = "0.7.0"
 git = "https://github.com/mozilla/uniffi-rs"
-branch = "tagged-unions"
+rev = "f7c8ccda783494ee507ea0f8a61f35b39527394f"
 
 [build-dependencies]
 uniffi_build = "0.7.0"
diff --git a/rust-sdk/src/olm.udl b/rust-sdk/src/olm.udl
index 7107a8b40e..30eee9a50d 100644
--- a/rust-sdk/src/olm.udl
+++ b/rust-sdk/src/olm.udl
@@ -50,7 +50,7 @@ dictionary Sas {
     Request request;
 };
 
-[TaggedUnion]
+[Enum]
 interface Request {
     ToDevice(string request_id, string event_type, string body);
     KeysUpload(string request_id, string body);