diff --git a/proto/signer.pb.go b/proto/signer.pb.go
index ce30950610..c7ccd824ff 100644
--- a/proto/signer.pb.go
+++ b/proto/signer.pb.go
@@ -94,8 +94,9 @@ func (m *PublicKey) GetKeyInfo() *KeyInfo {
 
 // Signature specifies a KeyInfo that was used for signing and signed content
 type Signature struct {
-	KeyInfo *KeyInfo `protobuf:"bytes,1,opt,name=keyInfo" json:"keyInfo,omitempty"`
-	Content []byte   `protobuf:"bytes,2,opt,name=content,proto3" json:"content,omitempty"`
+	KeyInfo   *KeyInfo   `protobuf:"bytes,1,opt,name=keyInfo" json:"keyInfo,omitempty"`
+	Algorithm *Algorithm `protobuf:"bytes,2,opt,name=algorithm" json:"algorithm,omitempty"`
+	Content   []byte     `protobuf:"bytes,3,opt,name=content,proto3" json:"content,omitempty"`
 }
 
 func (m *Signature) Reset()         { *m = Signature{} }
@@ -109,6 +110,13 @@ func (m *Signature) GetKeyInfo() *KeyInfo {
 	return nil
 }
 
+func (m *Signature) GetAlgorithm() *Algorithm {
+	if m != nil {
+		return m.Algorithm
+	}
+	return nil
+}
+
 // SignatureRequests specifies a KeyInfo, and content to be signed
 type SignatureRequest struct {
 	KeyID   *KeyID `protobuf:"bytes,1,opt,name=keyID" json:"keyID,omitempty"`
diff --git a/signer/api/rpc_api.go b/signer/api/rpc_api.go
index 67f2183f67..49f31b1953 100644
--- a/signer/api/rpc_api.go
+++ b/signer/api/rpc_api.go
@@ -113,7 +113,7 @@ func (s *SignerServer) Sign(ctx context.Context, sr *pb.SignatureRequest) (*pb.S
 			KeyID:     &pb.KeyID{ID: tufKey.ID()},
 			Algorithm: &pb.Algorithm{Algorithm: tufKey.Algorithm().String()},
 		},
-		Algorithm: signatures[0].Method,
+		Algorithm: &pb.Algorithm{Algorithm: signatures[0].Method.String()},
 		Content:   signatures[0].Signature,
 	}