diff --git a/modules/swagger-codegen/src/main/resources/php/api.mustache b/modules/swagger-codegen/src/main/resources/php/api.mustache
index db1d4c8cb4f..78eaeb7cc6b 100644
--- a/modules/swagger-codegen/src/main/resources/php/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/api.mustache
@@ -140,7 +140,18 @@ use \{{invokerPackage}}\ObjectSerializer;
         }{{/pathParams}}
         {{#formParams}}// form params
         if (${{paramName}} !== null) {
-            $formParams['{{baseName}}'] = {{#isFile}}'@' . {{/isFile}}$this->apiClient->getSerializer()->toFormValue(${{paramName}});
+            {{#isFile}}
+            // PHP 5.5 introduced a CurlFile object that deprecates the old @filename syntax
+            // See: https://wiki.php.net/rfc/curl-file-upload
+            if (function_exists('curl_file_create')) {
+                $formParams['{{baseName}}'] = curl_file_create($this->apiClient->getSerializer()->toFormValue(${{paramName}}));
+            } else {
+               $formParams['{{baseName}}'] = '@' . $this->apiClient->getSerializer()->toFormValue(${{paramName}});
+            }
+            {{/isFile}}
+            {{^isFile}}
+            $formParams['{{baseName}}'] = $this->apiClient->getSerializer()->toFormValue(${{paramName}});
+            {{/isFile}}
         }{{/formParams}}
         {{#bodyParams}}// body params
         $_tempBody = null;