diff --git a/flatmap/map.go b/flatmap/map.go
index 2bc8c761e..46b72c401 100644
--- a/flatmap/map.go
+++ b/flatmap/map.go
@@ -13,7 +13,7 @@ import (
 type Map map[string]string
 
 // Contains returns true if the map contains the given key.
-func (m Map) Contains (key string) bool {
+func (m Map) Contains(key string) bool {
 	for _, k := range m.Keys() {
 		if k == key {
 			return true