diff --git a/modules/swagger-codegen/src/main/resources/Javascript/api.mustache b/modules/swagger-codegen/src/main/resources/Javascript/api.mustache
index c9a2ad4e399..a42ad349820 100644
--- a/modules/swagger-codegen/src/main/resources/Javascript/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/Javascript/api.mustache
@@ -42,13 +42,13 @@
         '<baseName>': <paramName><#hasMore>,</hasMore></pathParams>
       };
       var queryParams = {<#queryParams>
-        '<baseName>': <#collectionFormat>this.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></queryParams>
+        '<baseName>': <#collectionFormat>this.apiClient.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></queryParams>
       };
       var headerParams = {<#headerParams>
         '<baseName>': <paramName><#hasMore>,</hasMore></headerParams>
       };
       var formParams = {<#formParams>
-        '<baseName>': <#collectionFormat>this.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></formParams>
+        '<baseName>': <#collectionFormat>this.apiClient.buildCollectionParam(<paramName>, '<collectionFormat>')</collectionFormat><^collectionFormat><paramName></collectionFormat><#hasMore>,</hasMore></formParams>
       };
 
       var authNames = [<#authMethods>'<name>'<#hasMore>, </hasMore></authMethods>];
diff --git a/samples/client/petstore/javascript/src/api/PetApi.js b/samples/client/petstore/javascript/src/api/PetApi.js
index 040032af439..07520e12414 100644
--- a/samples/client/petstore/javascript/src/api/PetApi.js
+++ b/samples/client/petstore/javascript/src/api/PetApi.js
@@ -102,7 +102,7 @@
       var pathParams = {
       };
       var queryParams = {
-        'status': this.buildCollectionParam(status, 'multi')
+        'status': this.apiClient.buildCollectionParam(status, 'multi')
       };
       var headerParams = {
       };
@@ -137,7 +137,7 @@
       var pathParams = {
       };
       var queryParams = {
-        'tags': this.buildCollectionParam(tags, 'multi')
+        'tags': this.apiClient.buildCollectionParam(tags, 'multi')
       };
       var headerParams = {
       };