diff --git a/lib/dns.js b/lib/dns.js
index ac3f6d6f0ec725..f68409f2ee6743 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -50,8 +50,7 @@ const {
 
 const dnsException = errors.dnsException;
 
-let promisesWarn = true;
-let promises; // Lazy loaded
+let promises = null; // Lazy loaded
 
 function onlookup(err, addresses) {
   if (err) {
@@ -269,7 +268,7 @@ function defaultResolverSetServers(servers) {
   setDefaultResolver(resolver);
   bindDefaultResolver(module.exports, Resolver.prototype);
 
-  if (promises !== undefined)
+  if (promises !== null)
     bindDefaultResolver(promises, promises.Resolver.prototype);
 }
 
@@ -318,10 +317,9 @@ Object.defineProperties(module.exports, {
     configurable: true,
     enumerable: false,
     get() {
-      if (promisesWarn) {
+      if (promises === null) {
         promises = require('internal/dns/promises');
         promises.setServers = defaultResolverSetServers;
-        promisesWarn = false;
         process.emitWarning('The dns.promises API is experimental',
                             'ExperimentalWarning');
       }
diff --git a/lib/fs.js b/lib/fs.js
index 2e4bdc89647aac..1a720f618189fd 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -86,12 +86,11 @@ const {
   validateUint32
 } = require('internal/validators');
 
-let promisesWarn = true;
 let truncateWarn = true;
 let fs;
 
 // Lazy loaded
-let promises;
+let promises = null;
 let watchers;
 let ReadFileContext;
 let ReadStream;
@@ -1931,9 +1930,8 @@ Object.defineProperties(fs, {
     configurable: true,
     enumerable: false,
     get() {
-      if (promisesWarn) {
+      if (promises === null) {
         promises = require('internal/fs/promises');
-        promisesWarn = false;
         process.emitWarning('The fs.promises API is experimental',
                             'ExperimentalWarning');
       }