diff --git a/lib/Onyx.js b/lib/Onyx.js
index b8777e35c..2c5fcc52e 100644
--- a/lib/Onyx.js
+++ b/lib/Onyx.js
@@ -817,7 +817,7 @@ function mergeCollection(collectionKey, collection) {
 function update(data) {
     // First, validate the Onyx object is in the format we expect
     _.each(data, ({onyxMethod, key}) => {
-        if (!_.contains(['clear', 'set', 'merge', 'mergeCollection'], onyxMethod)) {
+        if (!_.contains(['clear', 'set', 'merge', 'mergecollection'], onyxMethod)) {
             throw new Error(`Invalid onyxMethod ${onyxMethod} in Onyx update.`);
         }
         if (onyxMethod !== 'clear' && !_.isString(key)) {
@@ -833,7 +833,7 @@ function update(data) {
             case 'merge':
                 merge(key, value);
                 break;
-            case 'mergeCollection':
+            case 'mergecollection':
                 mergeCollection(key, value);
                 break;
             case 'clear':
diff --git a/tests/unit/onyxTest.js b/tests/unit/onyxTest.js
index 48772a81f..4bdf45f67 100644
--- a/tests/unit/onyxTest.js
+++ b/tests/unit/onyxTest.js
@@ -390,7 +390,7 @@ describe('Onyx', () => {
                 // WHEN we pass a mergeCollection data object to Onyx.update
                 Onyx.update([
                     {
-                        onyxMethod: 'mergeCollection',
+                        onyxMethod: 'mergecollection',
                         key: ONYX_KEYS.COLLECTION.TEST_KEY,
                         value: {
                             test_1: {