diff --git a/src/operations/reports/base-report-params.ts b/src/operations/reports/base-report-params.ts
index 1abae0e63..1ed4eb13f 100644
--- a/src/operations/reports/base-report-params.ts
+++ b/src/operations/reports/base-report-params.ts
@@ -1,4 +1,4 @@
-import { ReportSegmentsEnum } from './report-segments-enum'
+import { ReportSegments } from './report-segments'
 
 export interface BaseReportParams<RecordType, ReportMetrics> {
   /**
@@ -10,7 +10,7 @@ export interface BaseReportParams<RecordType, ReportMetrics> {
    * _Optional_. Dimension on which to segment the report. See segmentation details in the
    * following table.
    */
-  segment?: ReportSegmentsEnum
+  segment?: ReportSegments
 
   /**
    * The date for which to retrieve the performance report in YYYYMMDD format.
diff --git a/src/operations/reports/index.ts b/src/operations/reports/index.ts
index 1b233d84e..ffcb5b9d8 100644
--- a/src/operations/reports/index.ts
+++ b/src/operations/reports/index.ts
@@ -2,5 +2,5 @@ export * from './metrics/index'
 export * from './sponsored-brands/index'
 export * from './sponsored-products/index'
 export * from './report-response'
-export * from './report-segments-enum'
+export * from './report-segments'
 export * from './report-types-enum'
diff --git a/src/operations/reports/report-segments-enum.ts b/src/operations/reports/report-segments.ts
similarity index 61%
rename from src/operations/reports/report-segments-enum.ts
rename to src/operations/reports/report-segments.ts
index 3560728bd..96d6f19cd 100644
--- a/src/operations/reports/report-segments-enum.ts
+++ b/src/operations/reports/report-segments.ts
@@ -1,13 +1,16 @@
-export enum ReportSegmentsEnum {
+import * as t from 'io-ts'
+
+export const ReportSegments = t.union([
   /**
    * The optional dimension on which to segment a keyword report.
    * This is also referred to as the search terms report.
    */
-  QUERY = 'query',
+  t.literal('query'),
 
   /**
    * The optional dimension on which to segment a campaigns report.
    * Placement refers to the location on a page where your ad appears.
    */
-  PLACEMENT = 'placement',
-}
+  t.literal('placement'),
+])
+export type ReportSegments = t.TypeOf<typeof ReportSegments>
diff --git a/test/index.test.ts b/test/index.test.ts
index 2d281569a..63569b8b4 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -163,7 +163,7 @@ describe('index', () => {
         reportEnum.SponsoredProductsProductTargetingReportMetrics,
       )
       expect(index.ReportResponseStatus).toEqual(reportEnum.ReportResponseStatus)
-      expect(index.ReportSegmentsEnum).toEqual(reportEnum.ReportSegmentsEnum)
+      expect(index.ReportSegments).toEqual(reportEnum.ReportSegments)
       expect(index.SponsoredBrandsReportTypeEnum).toEqual(reportEnum.SponsoredBrandsReportTypeEnum)
       expect(index.SponsoredProductsReportTypeEnum).toEqual(
         reportEnum.SponsoredProductsReportTypeEnum,