diff --git a/src/store/addressbooks.js b/src/store/addressbooks.js
index 3432b6753d..507b2d3609 100644
--- a/src/store/addressbooks.js
+++ b/src/store/addressbooks.js
@@ -108,25 +108,25 @@ const mutations = {
 	/**
 	 * Toggle whether a Addressbook is Enabled
 	 *
-	 * @param {object} context the store mutations
+	 * @param {object} state the store data
 	 * @param {object} addressbook the addressbook to toggle
 	 */
-	toggleAddressbookEnabled(context, addressbook) {
-		addressbook = state.addressbooks.find((search) => search.id === addressbook.id)
-		addressbook.enabled = !addressbook.enabled
+	toggleAddressbookEnabled(state, addressbook) {
+		const storedAddressbook = state.addressbooks.find((search) => search.id === addressbook.id)
+		storedAddressbook.enabled = !storedAddressbook.enabled
 	},
 
 	/**
 	 * Rename a Addressbook
 	 *
-	 * @param {object} context the store mutations
+	 * @param {object} state the store data
 	 * @param {object} data destructuring object
 	 * @param {object} data.addressbook the addressbook to rename
 	 * @param {string} data.newName the new name of the addressbook
 	 */
-	renameAddressbook(context, { addressbook, newName }) {
-		addressbook = state.addressbooks.find((search) => search.id === addressbook.id)
-		addressbook.displayName = newName
+	renameAddressbook(state, { addressbook, newName }) {
+		const storedAddressbook = state.addressbooks.find((search) => search.id === addressbook.id)
+		storedAddressbook.displayName = newName
 	},
 
 	/**
diff --git a/tests/javascript/store/addressbooksMutations.test.js b/tests/javascript/store/addressbooksMutations.test.js
new file mode 100644
index 0000000000..96ba318693
--- /dev/null
+++ b/tests/javascript/store/addressbooksMutations.test.js
@@ -0,0 +1,43 @@
+/**
+ * SPDX-FileCopyrightText: 2026 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { computed } from 'vue'
+// The store index has to be imported first to avoid a circular import issue
+import store from '../../../src/store/index.js'
+
+describe('addressbooks mutations', () => {
+	beforeEach(() => {
+		store.state.addressbooks.addressbooks.splice(0)
+		store.commit('addAddressbook', {
+			id: 'ab1',
+			displayName: 'Address book',
+			enabled: true,
+			url: '/remote.php/dav/addressbooks/users/admin/ab1/',
+		})
+	})
+
+	test('toggleAddressbookEnabled updates the reactive state', () => {
+		const addressbook = store.getters.getAddressbooks[0]
+		const enabled = computed(() => addressbook.enabled)
+		expect(enabled.value).toBe(true)
+
+		store.commit('toggleAddressbookEnabled', addressbook)
+
+		expect(addressbook.enabled).toBe(false)
+		// the change has to be picked up by reactive consumers, e.g. the settings dialog
+		expect(enabled.value).toBe(false)
+	})
+
+	test('renameAddressbook updates the reactive state', () => {
+		const addressbook = store.getters.getAddressbooks[0]
+		const displayName = computed(() => addressbook.displayName)
+		expect(displayName.value).toBe('Address book')
+
+		store.commit('renameAddressbook', { addressbook, newName: 'Renamed' })
+
+		expect(addressbook.displayName).toBe('Renamed')
+		expect(displayName.value).toBe('Renamed')
+	})
+})