diff --git a/auth/services/irma/signer.go b/auth/services/irma/signer.go
index 936b73c75e..6d8316c3ba 100644
--- a/auth/services/irma/signer.go
+++ b/auth/services/irma/signer.go
@@ -102,10 +102,11 @@ func (v Signer) StartSigningSession(contract contract.Contract, _ map[string]int
 	}
 
 	// Start an IRMA session
+	// The empty string for requestor parameter is used because the nuts-node acts as a single requestor
 	sessionPointer, token, _, err := v.sessionHandler.StartSession(signatureRequest, func(result *server.SessionResult) {
 		log.Logger().Debug("Session done")
 		log.Logger().Trace(server.ToJson(result))
-	})
+	}, "")
 	if err != nil {
 		return nil, fmt.Errorf("error while creating session: %w", err)
 	}
@@ -216,6 +217,7 @@ func printQrCode(qrcode string) {
 // signingSessionHandler is an abstraction for the Irma Server, mainly for enabling better testing
 type signingSessionHandler interface {
 	GetSessionResult(token irmago.RequestorToken) (*server.SessionResult, error)
-	StartSession(request interface{}, handler server.SessionHandler) (*irmago.Qr, irmago.RequestorToken, *irmago.FrontendSessionRequest, error)
+	// StartSession starts an IRMA session. The requestor parameter identifies the party requesting the session.
+	StartSession(request interface{}, handler server.SessionHandler, requestor string) (*irmago.Qr, irmago.RequestorToken, *irmago.FrontendSessionRequest, error)
 	HandlerFunc() http.HandlerFunc
 }
diff --git a/auth/services/irma/validator_test.go b/auth/services/irma/validator_test.go
index 20ad04fdd8..219997b4c3 100644
--- a/auth/services/irma/validator_test.go
+++ b/auth/services/irma/validator_test.go
@@ -48,7 +48,7 @@ func (m *mockIrmaClient) GetSessionResult(token irma.RequestorToken) (*irmaserve
 	return m.sessionResult, nil
 }
 
-func (m *mockIrmaClient) StartSession(request interface{}, handler irmaservercore.SessionHandler) (*irma.Qr, irma.RequestorToken, *irma.FrontendSessionRequest, error) {
+func (m *mockIrmaClient) StartSession(request interface{}, handler irmaservercore.SessionHandler, requestor string) (*irma.Qr, irma.RequestorToken, *irma.FrontendSessionRequest, error) {
 	if m.err != nil {
 		return nil, "", nil, m.err
 	}