diff --git a/src/tests/createHeadlessForm.test.js b/src/tests/createHeadlessForm.test.js
index 41584642..375205cd 100644
--- a/src/tests/createHeadlessForm.test.js
+++ b/src/tests/createHeadlessForm.test.js
@@ -15,7 +15,6 @@ import {
   schemaInputTypeRadioOptionsWithDetails,
   schemaInputTypeSelectSoloDeprecated,
   schemaInputTypeSelectSolo,
-  schemaInputTypeSelectString,
   schemaInputTypeSelectMultipleDeprecated,
   schemaInputTypeSelectMultiple,
   schemaInputTypeSelectMultipleOptional,
@@ -432,7 +431,7 @@ describe('createHeadlessForm', () => {
   });
 
   describe('field support', () => {
-    function assertOptionsAllowed({ handleValidation, fieldName, validOptions, isString = false }) {
+    function assertOptionsAllowed({ handleValidation, fieldName, validOptions }) {
       const validateForm = (vals) => friendlyError(handleValidation(vals));
 
       // All allowed options are valid
@@ -440,34 +439,27 @@ describe('createHeadlessForm', () => {
         expect(validateForm({ [fieldName]: value })).toBeUndefined();
       });
 
-      if (!isString) {
-        // Any other arbitrary value is not valid.
-        expect(validateForm({ [fieldName]: 'blah-blah' })).toEqual({
-          [fieldName]: 'The option "blah-blah" is not valid.',
-        });
-
-        // Given undefined, it says it's a required field.
-        expect(validateForm({})).toEqual({
-          [fieldName]: 'Required field',
-        });
+      // Any other arbitrary value is not valid.
+      expect(validateForm({ [fieldName]: 'blah-blah' })).toEqual({
+        [fieldName]: 'The option "blah-blah" is not valid.',
+      });
 
-        // As required field, empty string ("") is also considered empty. @BUG RMT-518
-        // Expectation: The error to be "The option '' is not valid."
-        expect(validateForm({ [fieldName]: '' })).toEqual({
-          [fieldName]: 'Required field',
-        });
+      // Given undefined, it says it's a required field.
+      expect(validateForm({})).toEqual({
+        [fieldName]: 'Required field',
+      });
 
-        // As required field, null is also considered empty @BUG RMT-518
-        // Expectation: The error to be "The option null is not valid."
-        expect(validateForm({ [fieldName]: null })).toEqual({
-          [fieldName]: 'Required field',
-        });
-      }
+      // As required field, empty string ("") is also considered empty. @BUG RMT-518
+      // Expectation: The error to be "The option '' is not valid."
+      expect(validateForm({ [fieldName]: '' })).toEqual({
+        [fieldName]: 'Required field',
+      });
 
-      if (isString) {
-        // Any other arbitrary value is valid.
-        expect(validateForm({ [fieldName]: 'blah-blah' })).toBeUndefined();
-      }
+      // As required field, null is also considered empty @BUG RMT-518
+      // Expectation: The error to be "The option null is not valid."
+      expect(validateForm({ [fieldName]: null })).toEqual({
+        [fieldName]: 'Required field',
+      });
     }
 
     it('support "text" field type', () => {
@@ -639,41 +631,6 @@ describe('createHeadlessForm', () => {
       });
     });
 
-    it('supports "select" field type with string option', () => {
-      const { fields, handleValidation } = createHeadlessForm(schemaInputTypeSelectString);
-      const fieldSelect = fields[0];
-      expect(fieldSelect).toMatchObject({
-        name: 'browsers',
-        label: 'Browsers (solo)',
-        description: 'This solo select also includes a disabled option.',
-        options: [
-          {
-            value: 'chr',
-            label: 'Chrome',
-          },
-          {
-            value: 'ff',
-            label: 'Firefox',
-          },
-          {
-            value: 'ie',
-            label: 'Internet Explorer',
-            disabled: true,
-          },
-          { value: undefined, type: 'string', label: '{Create another}' },
-        ],
-      });
-
-      expect(fieldSelect).not.toHaveProperty('multiple');
-
-      assertOptionsAllowed({
-        handleValidation,
-        fieldName: 'browsers',
-        validOptions: ['chr', 'ff', 'ie'],
-        isString: true,
-      });
-    });
-
     it('supports "select" field type with multiple options @deprecated', () => {
       const result = createHeadlessForm(schemaInputTypeSelectMultipleDeprecated);
       expect(result).toMatchObject({
diff --git a/src/tests/helpers.js b/src/tests/helpers.js
index e2056ca1..984b65e3 100644
--- a/src/tests/helpers.js
+++ b/src/tests/helpers.js
@@ -238,11 +238,6 @@ export const mockSelectInputSolo = {
   },
 };
 
-export const mockSelectInputSoloCreatable = {
-  ...mockSelectInputSolo,
-  oneOf: [...mockSelectInputSolo.oneOf, { type: 'string', title: '{Create another}' }],
-};
-
 export const mockSelectInputMultiple = {
   title: 'Browsers (multiple)',
   description: 'This multi-select also includes a disabled option.',
@@ -942,10 +937,6 @@ export const schemaInputTypeSelectSolo = JSONSchemaBuilder()
   .setRequiredFields(['browsers'])
   .build();
 
-export const schemaInputTypeSelectString = JSONSchemaBuilder().addInput({
-  browsers: mockSelectInputSoloCreatable,
-});
-
 /** @deprecated */
 export const schemaInputTypeSelectMultipleDeprecated = JSONSchemaBuilder()
   .addInput({
diff --git a/src/yupSchema.js b/src/yupSchema.js
index 11b2ecc6..d92369b8 100644
--- a/src/yupSchema.js
+++ b/src/yupSchema.js
@@ -60,10 +60,7 @@ const validateMaxDate = (value, minDate) => {
 
 const yupSchemas = {
   text: validateOnlyStrings,
-  radioOrSelect: (options, isString) => {
-    if (isString) {
-      return string().nullable();
-    }
+  radioOrSelect: (options) => {
     return string()
       .nullable()
       .transform((value) => {
@@ -215,9 +212,8 @@ const getYupSchema = ({ inputType, ...field }) => {
   const jsonType = getJsonTypeInArray(field.jsonType);
 
   if (field.options?.length > 0) {
-    const isString = field.options?.findIndex((option) => option.type === 'string') > -1;
     const optionValues = getOptions(field);
-    return yupSchemas.radioOrSelect(optionValues, isString);
+    return yupSchemas.radioOrSelect(optionValues);
   }
 
   if (field.format === 'date') {