diff --git a/internal/controller/eventing/nats.go b/internal/controller/eventing/nats.go
index 65031b37..d261754d 100644
--- a/internal/controller/eventing/nats.go
+++ b/internal/controller/eventing/nats.go
@@ -34,6 +34,10 @@ func (r *Reconciler) reconcileNATSSubManager(ctx context.Context, eventing *v1al
 		if err := r.stopNATSSubManager(false, log); err != nil {
 			return err
 		}
+	} else if eventing.Status.BackendConfigHash != specHash {
+		// in case spec is change and subManager is not started yet (e.g. due to error)
+		// make natsSubManager nil to create a subManager with new values
+		r.natsSubManager = nil
 	}
 
 	if r.natsSubManager == nil {
diff --git a/internal/controller/eventing/nats_test.go b/internal/controller/eventing/nats_test.go
index ced1a7b6..c7005a14 100644
--- a/internal/controller/eventing/nats_test.go
+++ b/internal/controller/eventing/nats_test.go
@@ -131,7 +131,7 @@ func Test_reconcileNATSSubManager(t *testing.T) {
 			name: "it should retry to start subscription manager when subscription manager was " +
 				"successfully initialized but failed to start",
 			givenIsNATSSubManagerStarted: false,
-			givenHashBefore:              int64(0),
+			givenHashBefore:              int64(-7550677537009891034),
 			givenNATSSubManagerMock: func() *submanagermocks.Manager {
 				jetStreamSubManagerMock := new(submanagermocks.Manager)
 				jetStreamSubManagerMock.On("Init", mock.Anything).Return(nil).Once()
@@ -156,7 +156,7 @@ func Test_reconcileNATSSubManager(t *testing.T) {
 			wantAssertCheck:  true,
 			givenShouldRetry: true,
 			wantError:        errors.New("failed to start"),
-			wantHashAfter:    int64(0),
+			wantHashAfter:    int64(-7550677537009891034),
 		},
 		{
 			name:                         "it should update the subscription manager when the backend config changes",