diff --git a/operation.go b/operation.go
index 20b740b65..33da3637a 100644
--- a/operation.go
+++ b/operation.go
@@ -663,7 +663,7 @@ func (nested *nestedField) fillNestedSchema(response *spec.Response, ref spec.Re
 			Properties: props,
 		},
 	}
-	response.Schema.AllOf = []spec.Schema{spec.Schema{SchemaProps: spec.SchemaProps{Ref: ref}},nestedSpec}
+	response.Schema.AllOf = []spec.Schema{spec.Schema{SchemaProps: spec.SchemaProps{Ref: ref}}, nestedSpec}
 }
 
 var nestedObjectPattern = regexp.MustCompile(`^([\w\-\.\/]+)\{(.*)=([^\[\]]*)\}$`)