diff --git a/crates/ruma-state-res/benches/state_res_bench.rs b/crates/ruma-state-res/benches/state_res_bench.rs
index 6b9dde19..f279a100 100644
--- a/crates/ruma-state-res/benches/state_res_bench.rs
+++ b/crates/ruma-state-res/benches/state_res_bench.rs
@@ -63,7 +63,6 @@ fn resolution_shallow_auth_chain(c: &mut Criterion) {
             let ev_map: EventMap<Arc<StateEvent>> = store.0.clone();
             let state_sets = vec![state_at_bob.clone(), state_at_charlie.clone()];
             let _ = match state_res::resolve::<StateEvent, _>(
-                &room_id(),
                 &RoomVersionId::Version6,
                 &state_sets,
                 state_sets
@@ -120,7 +119,6 @@ fn resolve_deeper_event_set(c: &mut Criterion) {
         b.iter(|| {
             let state_sets = vec![state_set_a.clone(), state_set_b.clone()];
             let _ = match state_res::resolve::<StateEvent, _>(
-                &room_id(),
                 &RoomVersionId::Version6,
                 &state_sets,
                 state_sets
diff --git a/crates/ruma-state-res/src/lib.rs b/crates/ruma-state-res/src/lib.rs
index 781c3ee5..1e7b9a41 100644
--- a/crates/ruma-state-res/src/lib.rs
+++ b/crates/ruma-state-res/src/lib.rs
@@ -13,7 +13,7 @@ use ruma_events::{
     },
     EventType,
 };
-use ruma_identifiers::{EventId, RoomId, RoomVersionId};
+use ruma_identifiers::{EventId, RoomVersionId};
 use tracing::{debug, info, trace, warn};
 
 mod error;
@@ -53,7 +53,6 @@ pub type EventMap<T> = HashMap<EventId, T>;
 /// The caller of `resolve` must ensure that all the events are from the same room. Although this
 /// function takes a `RoomId` it does not check that each event is part of the same room.
 pub fn resolve<E, F>(
-    room_id: &RoomId,
     room_version: &RoomVersionId,
     state_sets: &[StateMap<EventId>],
     auth_chain_sets: Vec<HashSet<EventId>>,
@@ -80,7 +79,7 @@ where
     debug!("{:?}", conflicting);
 
     // The set of auth events that are not common across server forks
-    let mut auth_diff = get_auth_chain_diff(room_id, auth_chain_sets)?;
+    let mut auth_diff = get_auth_chain_diff(auth_chain_sets)?;
 
     // Add the auth_diff to conflicting now we have a full set of conflicting events
     auth_diff.extend(conflicting.values().cloned().flatten().flatten());
@@ -196,10 +195,7 @@ pub fn separate(
 }
 
 /// Returns a Vec of deduped EventIds that appear in some chains but not others.
-pub fn get_auth_chain_diff(
-    _room_id: &RoomId,
-    auth_chain_sets: Vec<HashSet<EventId>>,
-) -> Result<HashSet<EventId>> {
+pub fn get_auth_chain_diff(auth_chain_sets: Vec<HashSet<EventId>>) -> Result<HashSet<EventId>> {
     if let Some(first) = auth_chain_sets.first().cloned() {
         let common = auth_chain_sets
             .iter()
diff --git a/crates/ruma-state-res/src/test_utils.rs b/crates/ruma-state-res/src/test_utils.rs
index 70731ad2..fc50bdf3 100644
--- a/crates/ruma-state-res/src/test_utils.rs
+++ b/crates/ruma-state-res/src/test_utils.rs
@@ -109,7 +109,6 @@ pub fn do_check(
             );
 
             let resolved = state_res::resolve(
-                &room_id(),
                 &RoomVersionId::Version6,
                 &state_sets,
                 state_sets
diff --git a/crates/ruma-state-res/tests/res_with_auth_ids.rs b/crates/ruma-state-res/tests/res_with_auth_ids.rs
index 5f753a0e..dab48f1f 100644
--- a/crates/ruma-state-res/tests/res_with_auth_ids.rs
+++ b/crates/ruma-state-res/tests/res_with_auth_ids.rs
@@ -69,7 +69,6 @@ fn ban_with_auth_chains2() {
     let ev_map: EventMap<Arc<StateEvent>> = store.0.clone();
     let state_sets = vec![state_set_a, state_set_b];
     let resolved = match state_res::resolve::<StateEvent, _>(
-        &room_id(),
         &RoomVersionId::Version6,
         &state_sets,
         state_sets
diff --git a/crates/ruma-state-res/tests/state_res.rs b/crates/ruma-state-res/tests/state_res.rs
index ddaf3077..634e0032 100644
--- a/crates/ruma-state-res/tests/state_res.rs
+++ b/crates/ruma-state-res/tests/state_res.rs
@@ -262,7 +262,6 @@ fn test_event_map_none() {
     let ev_map: EventMap<Arc<StateEvent>> = store.0.clone();
     let state_sets = vec![state_at_bob, state_at_charlie];
     let resolved = match state_res::resolve::<StateEvent, _>(
-        &room_id(),
         &RoomVersionId::Version2,
         &state_sets,
         state_sets