diff --git a/tests/csapi/device_lists_test.go b/tests/csapi/device_lists_test.go
index 17340ccb..7012efa7 100644
--- a/tests/csapi/device_lists_test.go
+++ b/tests/csapi/device_lists_test.go
@@ -49,6 +49,7 @@ func TestDeviceListUpdates(t *testing.T) {
 						ed25519KeyID:    ed25519Key,
 						curve25519KeyID: curve25519Key,
 					},
+					"signatures": map[string]interface{}{},
 				},
 			}),
 		)