diff --git a/src/platforms/web/server/util.js b/src/platforms/web/server/util.js
index 00dd7843e81..274897050a3 100644
--- a/src/platforms/web/server/util.js
+++ b/src/platforms/web/server/util.js
@@ -19,7 +19,7 @@ const isAttr = makeMap(
 )
 
 const unsafeAttrCharRE = /[>/="'\u0009\u000a\u000c\u0020]/
-export const isSSRUnsafeAttr = name => {
+export const isSSRUnsafeAttr = (name: string): boolean => {
   return unsafeAttrCharRE.test(name)
 }
 
diff --git a/test/unit/features/directives/model-checkbox.spec.js b/test/unit/features/directives/model-checkbox.spec.js
index 2b73e23d302..7d48dd1b8ad 100644
--- a/test/unit/features/directives/model-checkbox.spec.js
+++ b/test/unit/features/directives/model-checkbox.spec.js
@@ -337,7 +337,7 @@ describe('Directive v-model checkbox', () => {
       expect(vm.$el.children[1].textContent).toBe('false')
     }).then(done)
   })
-  
+
   // #7811
   it('type should not be overwritten by v-bind', () => {
     const vm = new Vue({