diff --git a/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
index dcea1e0da574..0f7a7ef669fc 100644
--- a/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Javascript/ApiClient.mustache
@@ -650,7 +650,8 @@
       ];
     };
 
-    exports.getBasePathFromSettings = function(index, variables={}) {
+    exports.getBasePathFromSettings = function(index, variables) {
+        var variables = variables || {};
         var servers = this.hostSettings();
 
         // check array index out of bound
diff --git a/samples/client/petstore/javascript-promise/src/ApiClient.js b/samples/client/petstore/javascript-promise/src/ApiClient.js
index 3416af28c957..a9e635f9c8ee 100644
--- a/samples/client/petstore/javascript-promise/src/ApiClient.js
+++ b/samples/client/petstore/javascript-promise/src/ApiClient.js
@@ -597,7 +597,8 @@
       ];
     };
 
-    exports.getBasePathFromSettings = function(index, variables={}) {
+    exports.getBasePathFromSettings = function(index, variables) {
+        var variables = variables || {};
         var servers = this.hostSettings();
 
         // check array index out of bound
diff --git a/samples/client/petstore/javascript/src/ApiClient.js b/samples/client/petstore/javascript/src/ApiClient.js
index ed27f48fde16..91972a08cd9e 100644
--- a/samples/client/petstore/javascript/src/ApiClient.js
+++ b/samples/client/petstore/javascript/src/ApiClient.js
@@ -608,7 +608,8 @@
       ];
     };
 
-    exports.getBasePathFromSettings = function(index, variables={}) {
+    exports.getBasePathFromSettings = function(index, variables) {
+        var variables = variables || {};
         var servers = this.hostSettings();
 
         // check array index out of bound