diff --git a/ruma-client-api/Cargo.toml b/ruma-client-api/Cargo.toml
index 50014f5a..c6775af4 100644
--- a/ruma-client-api/Cargo.toml
+++ b/ruma-client-api/Cargo.toml
@@ -17,6 +17,7 @@ version = "0.10.0-alpha.1"
 edition = "2018"
 
 [dependencies]
+assign = "1.1.0"
 http = "0.2.1"
 js_int = { version = "0.1.9", features = ["serde"] }
 ruma-api = { version = "=0.17.0-alpha.1", path = "../ruma-api" }
diff --git a/ruma-client-api/src/r0/room/create_room.rs b/ruma-client-api/src/r0/room/create_room.rs
index 488d0873..557d5904 100644
--- a/ruma-client-api/src/r0/room/create_room.rs
+++ b/ruma-client-api/src/r0/room/create_room.rs
@@ -1,5 +1,6 @@
 //! [POST /_matrix/client/r0/createRoom](https://matrix.org/docs/spec/client_server/r0.6.0#post-matrix-client-r0-createroom)
 
+use assign::assign;
 use ruma_api::ruma_api;
 use ruma_common::Raw;
 use ruma_events::{
@@ -141,11 +142,7 @@ impl CreationContent {
         creator: UserId,
         room_version: RoomVersionId,
     ) -> CreateEventContent {
-        let mut res = CreateEventContent::new(creator);
-        res.federate = federate;
-        res.room_version = room_version;
-        res.predecessor = predecessor;
-        res
+        assign!(CreateEventContent::new(creator), { federate, room_version, predecessor })
     }
 }