diff --git a/packages/mongo/mongo_livedata_tests.js b/packages/mongo/mongo_livedata_tests.js
index 4e50d5d507..0bb6507047 100644
--- a/packages/mongo/mongo_livedata_tests.js
+++ b/packages/mongo/mongo_livedata_tests.js
@@ -700,7 +700,7 @@ _.each( [ 'MONGO', 'STRING'], function(idGeneration) {
           },
         });
 
-        const handle2 = await coll.find({ run }).observeChanges(
+        const handle2 = await coll.find({ run }).observeChangesAsync(
           {
             added: expectNotMutatable,
             changed: function(id, o) {
@@ -2017,7 +2017,7 @@ _.each( [ 'MONGO', 'STRING'], function(idGeneration) {
         let polls = {};
         const handlesToStop = [];
         const observe = async function(name, query) {
-          const handle = await coll.find(query).observeChanges({
+          const handle = await coll.find(query).observeChangesAsync({
             // Make sure that we only poll on invalidation, not due to time, and
             // keep track of when we do. Note: this option disables the use of
             // oplogs (which admittedly is somewhat irrelevant to this feature).
@@ -3149,7 +3149,7 @@ if (Meteor.isServer) {
     async function (test, expect) {
       var self = this;
       if (self.miniC) {
-        self.obs = await self.miniC.find().observeChanges({
+        self.obs = await self.miniC.find().observeChangesAsync({
           added: async function (id, fields) {
             self.events.push({evt: "a", id: id});
             await Meteor._sleepForMs(200);
@@ -3476,13 +3476,13 @@ Meteor.isServer &&
     if (MongoInternals.defaultRemoteCollectionDriver().mongo._oplogHandle) {
       var observeWithOplog = await coll
         .find({ x: 5 })
-        .observeChanges({ added: function() {} });
+        .observeChangesAsync({ added: function() {} });
       test.isTrue(observeWithOplog._multiplexer._observeDriver._usesOplog);
       await observeWithOplog.stop();
     }
     var observeWithoutOplog = await coll
       .find({ x: 6 }, { _disableOplog: true })
-      .observeChanges({ added: function() {} });
+      .observeChangesAsync({ added: function() {} });
     test.isFalse(observeWithoutOplog._multiplexer._observeDriver._usesOplog);
     await observeWithoutOplog.stop();
   });
@@ -3506,7 +3506,7 @@ Meteor.isServer &&
       var output = [];
       var handle = await coll
         .find({ a: 1, b: 2 }, { fields: { c: 1 } })
-        .observeChanges({
+        .observeChangesAsync({
           added: function(id, fields) {
             output.push(['added', id, fields]);
           },
@@ -3559,7 +3559,7 @@ Meteor.isServer &&
     );
 
     var changesOutput = [];
-    var changesHandle = await cursor.observeChanges({
+    var changesHandle = await cursor.observeChangesAsync({
       added: function(id, fields) {
         changesOutput.push(['added', fields]);
       },
@@ -3604,7 +3604,7 @@ Meteor.isServer &&
     var tmp;
 
     var output = [];
-    var handle = await coll.find({ a: 'foo' }).observeChanges({
+    var handle = await coll.find({ a: 'foo' }).observeChangesAsync({
       added: function(id, fields) {
         output.push(['added', id, fields]);
       },
@@ -3717,7 +3717,7 @@ testAsyncMulti('mongo-livedata - oplog - update EJSON', [
   async function(test, expect) {
     var self = this;
     self.changes = [];
-    self.handle = await self.collection.find({}).observeChanges({
+    self.handle = await self.collection.find({}).observeChangesAsync({
       added: function(id, fields) {
         self.changes.push(['a', id, fields]);
       },
@@ -3819,7 +3819,7 @@ Meteor.isServer &&
     _.times(100, async function() {
       await coll.insertAsync({ foo: 'baz' });
     });
-    var handler = await coll.find({}).observeChanges({
+    var handler = await coll.find({}).observeChangesAsync({
       added: async function(id) {
         await coll.updateAsync(id, { $set: { foo: 'bar' } });
       },
@@ -4050,7 +4050,7 @@ if (Meteor.isClient) {
       futuresByNonce[nonce] = new Promise(r => (resolver = r));
       var observe = await fenceOnBeforeFireErrorCollection
         .find({ nonce: nonce })
-        .observeChanges({ added: function() {} });
+        .observeChangesAsync({ added: function() {} });
       Meteor.setTimeout(async function() {
         try {
           await fenceOnBeforeFireErrorCollection.insertAsync({ nonce });
@@ -4214,7 +4214,7 @@ if (Meteor.isServer) {
         resolve();
       }
 
-      const observeHandle = await Collection.find().observeChanges({
+      const observeHandle = await Collection.find().observeChangesAsync({
         async changed(id, fields) {
           let expectedValue;
 
diff --git a/packages/mongo/observe_changes_tests.js b/packages/mongo/observe_changes_tests.js
index 30004d4b1d..6fff210a9e 100644
--- a/packages/mongo/observe_changes_tests.js
+++ b/packages/mongo/observe_changes_tests.js
@@ -25,7 +25,7 @@ _.each ([{added: 'added', forceOrdered: true},
         var barid = await c.insertAsync({ thing: 'stuff' });
         var fooid = await c.insertAsync({ noodles: 'good', bacon: 'bad', apples: 'ok' });
 
-        var handle = await c.find(fooid).observeChanges(logger);
+        var handle = await c.find(fooid).observeChangesAsync(logger);
         if (added === 'added') {
           await logger.expectResult(added, [
             fooid,
@@ -60,7 +60,7 @@ _.each ([{added: 'added', forceOrdered: true},
 
         const badCursor = c.find({}, { fields: { noodles: 1, _id: false } });
         await test.throwsAsync(async function() {
-          await badCursor.observeChanges(logger);
+          await badCursor.observeChangesAsync(logger);
         });
 
         onComplete();
@@ -81,10 +81,10 @@ Tinytest.addAsync('observeChanges - callback isolation', async function(
     async function(logger) {
       var handles = [];
       var cursor = c.find();
-      handles.push(await cursor.observeChanges(logger));
+      handles.push(await cursor.observeChangesAsync(logger));
       // fields-tampering observer
       handles.push(
-        await cursor.observeChanges({
+        await cursor.observeChangesAsync({
           added: function(id, fields) {
             fields.apples = 'green';
           },
@@ -122,7 +122,7 @@ Tinytest.addAsync('observeChanges - single id - initial adds', async function(
     Meteor.isServer,
     async function(logger) {
       var fooid = await c.insertAsync({ noodles: 'good', bacon: 'bad', apples: 'ok' });
-      var handle = await c.find(fooid).observeChanges(logger);
+      var handle = await c.find(fooid).observeChangesAsync(logger);
       await logger.expectResult('added', [
         fooid,
         { noodles: 'good', bacon: 'bad', apples: 'ok' },
@@ -148,7 +148,7 @@ Tinytest.addAsync('observeChanges - unordered - initial adds', async function(
     async function(logger) {
       var fooid = await c.insertAsync({ noodles: 'good', bacon: 'bad', apples: 'ok' });
       var barid = await c.insertAsync({ noodles: 'good', bacon: 'weird', apples: 'ok' });
-      var handle = await c.find().observeChanges(logger);
+      var handle = await c.find().observeChangesAsync(logger);
       await logger.expectResultUnordered([
         {
           callback: 'added',
@@ -176,7 +176,7 @@ Tinytest.addAsync('observeChanges - unordered - basics', async function(
     ['added', 'changed', 'removed'],
     Meteor.isServer,
     async function(logger) {
-      var handle = await c.find().observeChanges(logger);
+      var handle = await c.find().observeChangesAsync(logger);
       var barid = await c.insertAsync({ thing: 'stuff' });
       await logger.expectResultOnly('added', [barid, { thing: 'stuff' }]);
 
@@ -228,7 +228,7 @@ if (Meteor.isServer) {
       async function(logger) {
         var handle = await c
           .find({}, { fields: { noodles: 1, bacon: 1 } })
-          .observeChanges(logger);
+          .observeChangesAsync(logger);
         var barid = await c.insertAsync({ thing: 'stuff' });
         await logger.expectResultOnly('added', [barid, {}]);
 
@@ -281,7 +281,7 @@ if (Meteor.isServer) {
               { mac: 1, cheese: 2 },
               { fields: { noodles: 1, bacon: 1, eggs: 1 } }
             )
-            .observeChanges(logger);
+            .observeChangesAsync(logger);
           var barid = await c.insertAsync({ thing: 'stuff', mac: 1, cheese: 2 });
           await logger.expectResultOnly('added', [barid, {}]);
 
@@ -360,7 +360,7 @@ Tinytest.addAsync(
             { mac: 1, cheese: 2 },
             { fields: { noodles: 1, bacon: 1, eggs: 1 } }
           )
-          .observeChanges(logger);
+          .observeChangesAsync(logger);
         var fooid = await c.insertAsync({
           noodles: 'good',
           bacon: 'bad',
@@ -402,7 +402,7 @@ Tinytest.addAsync(
       async function(logger) {
         var handle = await c
           .find({}, { fields: { 'type.name': 1 } })
-          .observeChanges(logger);
+          .observeChangesAsync(logger);
         var id = await c.insertAsync({ type: { name: 'foobar' } });
         await logger.expectResultOnly('added', [id, { type: { name: 'foobar' } }]);
 
@@ -428,7 +428,7 @@ Tinytest.addAsync(
       ['added', 'changed', 'removed'],
       Meteor.isServer,
       async function(logger) {
-        var handle = await c.find({ noodles: 'good' }).observeChanges(logger);
+        var handle = await c.find({ noodles: 'good' }).observeChangesAsync(logger);
         var barid = await c.insertAsync({ thing: 'stuff' });
 
         var fooid = await c.insertAsync({ noodles: 'good', bacon: 'bad', apples: 'ok' });
@@ -492,7 +492,7 @@ if (Meteor.isServer) {
       self.expects.push(resolver);
 
       var cursor = coll.find({ y: { $ne: 7 } }, { tailable: true });
-      self.handle = await cursor.observeChanges({
+      self.handle = await cursor.observeChangesAsync({
         added: function(id, fields) {
           self.xs.push(fields.x);
           test.notEqual(self.expects.length, 0);
@@ -550,7 +550,7 @@ testAsyncMulti("observeChanges - bad query", [
     var c = makeCollection();
     var observeThrows = async function () {
       await test.throwsAsync(async function () {
-        await c.find({__id: {$in: null}}).observeChanges({
+        await c.find({__id: {$in: null}}).observeChangesAsync({
           added: function () {
             test.fail("added shouldn't be called");
           }
@@ -588,7 +588,7 @@ if (Meteor.isServer) {
       await environmentVariable.withValue(true, async function() {
         var handle = await c
           .find({}, { fields: { 'type.name': 1 } })
-          .observeChanges({
+          .observeChangesAsync({
             added: function() {
               test.isTrue(environmentVariable.get());
               handle.stop();
diff --git a/tools/tests/apps/failover-test/server/failover-test.js b/tools/tests/apps/failover-test/server/failover-test.js
index 81b41117aa..e2e705b128 100644
--- a/tools/tests/apps/failover-test/server/failover-test.js
+++ b/tools/tests/apps/failover-test/server/failover-test.js
@@ -63,7 +63,7 @@ steps.steppedDown = function () {
   process.exit(0);
 };
 
-C.find().observeChanges({
+C.find().observeChangesAsync({
   added: function (id, fields) {
     if (nextStepTimeout) {
       Meteor.clearTimeout(nextStepTimeout);