diff --git a/ekm/genesis_adapter.go b/ekm/genesis_adapter.go
index f84ec7457b..877d8c2672 100644
--- a/ekm/genesis_adapter.go
+++ b/ekm/genesis_adapter.go
@@ -4,6 +4,7 @@ import (
 	"github.com/attestantio/go-eth2-client/spec/phase0"
 	ssz "github.com/ferranbt/fastssz"
 	"github.com/herumi/bls-eth-go-binary/bls"
+	"github.com/pkg/errors"
 	genesisspectypes "github.com/ssvlabs/ssv-spec-pre-cc/types"
 	spectypes "github.com/ssvlabs/ssv-spec/types"
 )
@@ -13,6 +14,37 @@ type GenesisKeyManagerAdapter struct {
 }
 
 func (k *GenesisKeyManagerAdapter) SignBeaconObject(obj ssz.HashRoot, domain phase0.Domain, pk []byte, domainType phase0.DomainType) (genesisspectypes.Signature, [32]byte, error) {
+	// Convert genesisspectypes to spectypes before passing on to KeyManager.
+	switch domainType {
+	case genesisspectypes.DomainAttester:
+	case genesisspectypes.DomainProposer:
+	case genesisspectypes.DomainVoluntaryExit:
+	case genesisspectypes.DomainAggregateAndProof:
+	case genesisspectypes.DomainSelectionProof:
+		data, ok := obj.(genesisspectypes.SSZUint64)
+		if !ok {
+			return nil, [32]byte{}, errors.New("could not cast obj to SSZUint64")
+		}
+		obj = spectypes.SSZUint64(data)
+	case genesisspectypes.DomainRandao:
+		data, ok := obj.(genesisspectypes.SSZUint64)
+		if !ok {
+			return nil, [32]byte{}, errors.New("could not cast obj to SSZUint64")
+		}
+		obj = spectypes.SSZUint64(data)
+	case genesisspectypes.DomainSyncCommittee:
+		data, ok := obj.(genesisspectypes.SSZBytes)
+		if !ok {
+			return nil, [32]byte{}, errors.New("could not cast obj to SSZBytes")
+		}
+		obj = spectypes.SSZBytes(data)
+	case genesisspectypes.DomainSyncCommitteeSelectionProof:
+	case genesisspectypes.DomainContributionAndProof:
+	case genesisspectypes.DomainApplicationBuilder:
+	default:
+		return nil, [32]byte{}, errors.New("domain unknown")
+	}
+
 	signature, root, err := k.KeyManager.SignBeaconObject(obj, domain, pk, domainType)
 	if err != nil {
 		return nil, [32]byte{}, err