diff --git a/lightclient-circuits/src/committee_update_circuit.rs b/lightclient-circuits/src/committee_update_circuit.rs
index c8132595..d6646205 100644
--- a/lightclient-circuits/src/committee_update_circuit.rs
+++ b/lightclient-circuits/src/committee_update_circuit.rs
@@ -136,15 +136,18 @@ impl<S: Spec, F: Field> CommitteeUpdateCircuit<S, F> {
         Ok(public_inputs)
     }
 
-    pub fn instance(args: &witness::CommitteeRotationArgs<S, F>) -> Vec<Vec<bn256::Fr>> {
+    pub fn instance(args: &witness::CommitteeRotationArgs<S, F>) -> Vec<Vec<bn256::Fr>>
+    where
+        [(); { S::SYNC_COMMITTEE_SIZE }]:,
+    {
         let pubkeys_x = args.pubkeys_compressed.iter().cloned().map(|mut bytes| {
-            bytes[47] &= 0b11111000;
+            bytes[47] &= 0b00011111;
             bls12_381::Fq::from_bytes_le(&bytes)
         });
 
         let poseidon_commitment = fq_array_poseidon_native::<bn256::Fr>(pubkeys_x).unwrap();
 
-        let mut pk_vector: Vector<Vector<u8, 48>, 512> = args
+        let mut pk_vector: Vector<Vector<u8, 48>, { S::SYNC_COMMITTEE_SIZE }> = args
             .pubkeys_compressed
             .iter()
             .cloned()
diff --git a/lightclient-circuits/src/poseidon.rs b/lightclient-circuits/src/poseidon.rs
index c2f83e04..a3403716 100644
--- a/lightclient-circuits/src/poseidon.rs
+++ b/lightclient-circuits/src/poseidon.rs
@@ -54,7 +54,6 @@ pub fn fq_array_poseidon_native<F: Field>(
                 .collect_vec()
         })
         .collect_vec();
-
     let mut poseidon = PoseidonNative::<F, POSEIDON_SIZE, { POSEIDON_SIZE - 1 }>::new(R_F, R_P);
     let mut current_poseidon_hash = None;