diff --git a/src/api/client/room.rs b/src/api/client/room.rs
index 96c43758..442fe266 100644
--- a/src/api/client/room.rs
+++ b/src/api/client/room.rs
@@ -230,8 +230,7 @@ pub(crate) async fn create_room_route(
 		_ => RoomPreset::PrivateChat, // Room visibility should not be custom
 	});
 
-	let mut users = BTreeMap::new();
-	users.insert(sender_user.clone(), int!(100));
+	let mut users = BTreeMap::from_iter([(sender_user.clone(), int!(100))]);
 
 	if preset == RoomPreset::TrustedPrivateChat {
 		for invite_ in &body.invite {
diff --git a/src/service/admin/create.rs b/src/service/admin/create.rs
index ef84d803..4e2b831c 100644
--- a/src/service/admin/create.rs
+++ b/src/service/admin/create.rs
@@ -101,8 +101,7 @@ pub async fn create_admin_room(services: &Services) -> Result<()> {
 		.await?;
 
 	// 3. Power levels
-	let mut users = BTreeMap::new();
-	users.insert(server_user.clone(), 100.into());
+	let users = BTreeMap::from_iter([(server_user.clone(), 100.into())]);
 
 	services
 		.rooms
diff --git a/src/service/admin/grant.rs b/src/service/admin/grant.rs
index 3fe2441f..b4589ebc 100644
--- a/src/service/admin/grant.rs
+++ b/src/service/admin/grant.rs
@@ -86,9 +86,7 @@ impl super::Service {
 			.await?;
 
 		// Set power level
-		let mut users = BTreeMap::new();
-		users.insert(server_user.clone(), 100.into());
-		users.insert(user_id.to_owned(), 100.into());
+		let users = BTreeMap::from_iter([(server_user.clone(), 100.into()), (user_id.to_owned(), 100.into())]);
 
 		self.services
 			.timeline