diff --git a/modules/swagger-codegen/src/main/resources/go/api_client.mustache b/modules/swagger-codegen/src/main/resources/go/api_client.mustache
index ad2d148e052..b5656eaabf2 100644
--- a/modules/swagger-codegen/src/main/resources/go/api_client.mustache
+++ b/modules/swagger-codegen/src/main/resources/go/api_client.mustache
@@ -75,7 +75,7 @@ func (c *ApiClient) CallApi(path string, method string,
 }
 
 func (c *ApiClient) ParameterToString (obj interface{}) string {
-    if reflect.TypeOf(obj).Len()  > 0 {
+    if reflect.TypeOf(obj).String() == "[]string" {
         return strings.Join(obj.([]string), ",")
     } else{
         return obj.(string)
diff --git a/samples/client/petstore/go/go-petstore/api_client.go b/samples/client/petstore/go/go-petstore/api_client.go
index 3440a83a9fd..e530c1d1777 100644
--- a/samples/client/petstore/go/go-petstore/api_client.go
+++ b/samples/client/petstore/go/go-petstore/api_client.go
@@ -75,7 +75,7 @@ func (c *ApiClient) CallApi(path string, method string,
 }
 
 func (c *ApiClient) ParameterToString (obj interface{}) string {
-    if reflect.TypeOf(obj).Len()  > 0 {
+    if reflect.TypeOf(obj).String() == "[]string" {
         return strings.Join(obj.([]string), ",")
     } else{
         return obj.(string)