diff --git a/src/lib/nullifier.ts b/src/lib/nullifier.ts
index 033187685d..c8e84984ef 100644
--- a/src/lib/nullifier.ts
+++ b/src/lib/nullifier.ts
@@ -5,7 +5,6 @@ import { Poseidon } from './hash.js';
 import { MerkleMapWitness } from './merkle-map.js';
 import { PrivateKey, PublicKey, scaleShifted } from './signature.js';
 import { Provable } from './provable.js';
-import { Bool } from './bool.js';
 
 export { Nullifier };
 
@@ -71,10 +70,7 @@ class Nullifier extends Struct({
 
     // shifted scalar see https://github.com/o1-labs/o1js/blob/5333817a62890c43ac1b9cb345748984df271b62/src/lib/signature.ts#L220
     // pk^c
-    let pk_c = scaleShifted(
-      this.publicKey,
-      Scalar.fromBits(c.toBits().concat(new Bool(false)))
-    );
+    let pk_c = scaleShifted(this.publicKey, Scalar.fromBits(c.toBits()));
 
     // g^r = g^s / pk^c
     let g_r = G.scale(s).sub(pk_c);
@@ -84,10 +80,7 @@ class Nullifier extends Struct({
 
     // h_m_pk_r =  h(m,pk)^s / nullifier^c
     let h_m_pk_s_div_nullifier_s = h_m_pk_s.sub(
-      scaleShifted(
-        nullifier,
-        Scalar.fromBits(c.toBits().concat(new Bool(false)))
-      )
+      scaleShifted(nullifier, Scalar.fromBits(c.toBits()))
     );
 
     // this is supposed to match the entries generated on "the other side" of the nullifier (mina-signer, in an wallet enclave)