diff --git a/prover/zkevm/prover/ecpair/ecpair_constraints.go b/prover/zkevm/prover/ecpair/ecpair_constraints.go
index 40e5c5be4..979f51769 100644
--- a/prover/zkevm/prover/ecpair/ecpair_constraints.go
+++ b/prover/zkevm/prover/ecpair/ecpair_constraints.go
@@ -29,6 +29,8 @@ func (ec *ECPair) csBinaryConstraints(comp *wizard.CompiledIOP) {
 	common.MustBeBinary(comp, ec.UnalignedG2MembershipData.IsPulling)
 	common.MustBeBinary(comp, ec.UnalignedG2MembershipData.IsComputed)
 	common.MustBeBinary(comp, ec.UnalignedG2MembershipData.ToG2MembershipCircuitMask)
+	common.MustBeBinary(comp, ec.UnalignedPairingData.IsFirstLineOfPrevAccumulator)
+	common.MustBeBinary(comp, ec.UnalignedPairingData.IsFirstLineOfCurrAccumulator)
 }
 
 func (ec *ECPair) csFlagConsistency(comp *wizard.CompiledIOP) {