diff --git a/src/tests/unit/components/Envelope.vue.spec.js b/src/tests/unit/components/Envelope.vue.spec.js
index a2353a45c9..ede0dd0757 100644
--- a/src/tests/unit/components/Envelope.vue.spec.js
+++ b/src/tests/unit/components/Envelope.vue.spec.js
@@ -52,6 +52,7 @@ describe('Envelope', () => {
 			getAccount: () => (id) => ({}),
 			getEnvelopeTags: () => (id) => ([]),
 			getMailbox: () => (id) => ({}),
+			getPreference: () => (key, defaultValue) => defaultValue,
 		}
 		store = new Vuex.Store({
 			actions,