diff --git a/src/v0/destinations/marketo_bulk_upload/config.js b/src/v0/destinations/marketo_bulk_upload/config.js
index 36b3c2ff93..e3268711fe 100644
--- a/src/v0/destinations/marketo_bulk_upload/config.js
+++ b/src/v0/destinations/marketo_bulk_upload/config.js
@@ -33,6 +33,7 @@ const SCHEMA_DATA_TYPE_MAP = {
   email: 'string',
   phone: 'string',
   url: 'string',
+  object: 'object',
 };
 
 module.exports = {
diff --git a/src/v0/destinations/marketo_bulk_upload/marketo_bulk_upload.util.test.js b/src/v0/destinations/marketo_bulk_upload/marketo_bulk_upload.util.test.js
index 8d40d303ed..875b0d8280 100644
--- a/src/v0/destinations/marketo_bulk_upload/marketo_bulk_upload.util.test.js
+++ b/src/v0/destinations/marketo_bulk_upload/marketo_bulk_upload.util.test.js
@@ -357,7 +357,7 @@ describe('getAccessToken', () => {
 
 describe('checkEventStatusViaSchemaMatching', () => {
   // The function correctly identifies fields with expected data types.
-  it('should correctly identify fields with expected data types', () => {
+  it('if event data types match with expected data types we send no field as mismatch', () => {
     const event = {
       input: [
         {
@@ -384,7 +384,7 @@ describe('checkEventStatusViaSchemaMatching', () => {
   });
 
   // The function correctly identifies fields with unexpected data types.
-  it('should correctly identify fields with unexpected data types', () => {
+  it('if event data types do not match with expected data types we send that field as mismatch', () => {
     const event = {
       input: [
         {
@@ -413,7 +413,7 @@ describe('checkEventStatusViaSchemaMatching', () => {
   });
 
   // The function correctly handles events with multiple fields.
-  it('should correctly handle events with multiple fields', () => {
+  it('For array of events the mismatch object fills up with each event errors', () => {
     const event = {
       input: [
         {
@@ -454,7 +454,7 @@ describe('checkEventStatusViaSchemaMatching', () => {
   });
 
   // The function correctly handles events with missing fields.
-  it('should have no effect with missing fields', () => {
+  it('it is not mandatory to send all the fields present in schema', () => {
     const event = {
       input: [
         {
@@ -480,7 +480,7 @@ describe('checkEventStatusViaSchemaMatching', () => {
   });
 
   // The function correctly handles events with additional fields. But this will not happen in our use case
-  it('should correctly handle events with additional fields', () => {
+  it('for any field beyond schema fields will be mapped as invalid', () => {
     const event = {
       input: [
         {
diff --git a/src/v0/destinations/marketo_bulk_upload/util.js b/src/v0/destinations/marketo_bulk_upload/util.js
index fb6a0b1365..fac04af431 100644
--- a/src/v0/destinations/marketo_bulk_upload/util.js
+++ b/src/v0/destinations/marketo_bulk_upload/util.js
@@ -402,14 +402,9 @@ const checkEventStatusViaSchemaMatching = (event, fieldMap) => {
     const { job_id } = metadata;
 
     Object.entries(message).forEach(([paramName, paramValue]) => {
-      let expectedDataType = SCHEMA_DATA_TYPE_MAP[fieldMap[paramName]];
+      const expectedDataType = SCHEMA_DATA_TYPE_MAP[fieldMap[paramName]];
       const actualDataType = typeof paramValue;
 
-      // If expectedDataType is not one of the primitive data types, treat it as a string
-      if (!['string', 'number', 'boolean', 'undefined'].includes(expectedDataType)) {
-        expectedDataType = 'string';
-      }
-
       if (!mismatchedFields[job_id] && actualDataType !== expectedDataType) {
         mismatchedFields[job_id] = `invalid ${paramName}`;
       }