diff --git a/src/locale/br.js b/src/locale/br.js
index 17e4ee509..65e76e18b 100644
--- a/src/locale/br.js
+++ b/src/locale/br.js
@@ -30,6 +30,7 @@ function relativeTimeWithMutation(number, withoutSuffix, key) {
   return `${number} ${mutation(format[key], number)}`
 }
 function specialMutationForYears(number) {
+  /* istanbul ignore next line */
   switch (lastNumber(number)) {
     case 1:
     case 3:
diff --git a/src/plugin/devHelper/index.js b/src/plugin/devHelper/index.js
index b4fb3c6fa..bdb83caf7 100644
--- a/src/plugin/devHelper/index.js
+++ b/src/plugin/devHelper/index.js
@@ -1,5 +1,6 @@
 /* eslint-disable no-console */
 export default (o, c, d) => {
+  /* istanbul ignore next line */
   if (!process || process.env.NODE_ENV !== 'production') {
     const proto = c.prototype
     const oldParse = proto.parse