diff --git a/modules/swagger-codegen/src/main/resources/TypeScript-Fetch/api.mustache b/modules/swagger-codegen/src/main/resources/TypeScript-Fetch/api.mustache
index ab0b3c8523b..5bf0ed7fb92 100644
--- a/modules/swagger-codegen/src/main/resources/TypeScript-Fetch/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/TypeScript-Fetch/api.mustache
@@ -10,7 +10,7 @@ import * as assign from "core-js/library/fn/object/assign";
 interface Dictionary<T> { [index: string]: T; }
 export interface FetchAPI { (url: string, init?: any): Promise<any>; }
 
-const BASE_PATH = "{{basePath}}";
+const BASE_PATH = "{{{basePath}}}".replace(/\/+$/, '');
 
 export interface FetchArgs {
     url: string;
diff --git a/samples/client/petstore/typescript-fetch/builds/default/api.ts b/samples/client/petstore/typescript-fetch/builds/default/api.ts
index 7fb386b373e..a83e38286ac 100644
--- a/samples/client/petstore/typescript-fetch/builds/default/api.ts
+++ b/samples/client/petstore/typescript-fetch/builds/default/api.ts
@@ -31,7 +31,7 @@ import * as assign from "core-js/library/fn/object/assign";
 interface Dictionary<T> { [index: string]: T; }
 export interface FetchAPI { (url: string, init?: any): Promise<any>; }
 
-const BASE_PATH = "http://petstore.swagger.io/v2";
+const BASE_PATH = "http://petstore.swagger.io/v2".replace(/\/+$/, '');
 
 export interface FetchArgs {
     url: string;
diff --git a/samples/client/petstore/typescript-fetch/builds/es6-target/api.ts b/samples/client/petstore/typescript-fetch/builds/es6-target/api.ts
index d27ef74f82e..bf3b7c9bab2 100644
--- a/samples/client/petstore/typescript-fetch/builds/es6-target/api.ts
+++ b/samples/client/petstore/typescript-fetch/builds/es6-target/api.ts
@@ -30,7 +30,7 @@ import * as isomorphicFetch from "isomorphic-fetch";
 interface Dictionary<T> { [index: string]: T; }
 export interface FetchAPI { (url: string, init?: any): Promise<any>; }
 
-const BASE_PATH = "http://petstore.swagger.io/v2";
+const BASE_PATH = "http://petstore.swagger.io/v2".replace(/\/+$/, '');
 
 export interface FetchArgs {
     url: string;
diff --git a/samples/client/petstore/typescript-fetch/builds/with-npm-version/api.ts b/samples/client/petstore/typescript-fetch/builds/with-npm-version/api.ts
index 7fb386b373e..a83e38286ac 100644
--- a/samples/client/petstore/typescript-fetch/builds/with-npm-version/api.ts
+++ b/samples/client/petstore/typescript-fetch/builds/with-npm-version/api.ts
@@ -31,7 +31,7 @@ import * as assign from "core-js/library/fn/object/assign";
 interface Dictionary<T> { [index: string]: T; }
 export interface FetchAPI { (url: string, init?: any): Promise<any>; }
 
-const BASE_PATH = "http://petstore.swagger.io/v2";
+const BASE_PATH = "http://petstore.swagger.io/v2".replace(/\/+$/, '');
 
 export interface FetchArgs {
     url: string;