diff --git a/api.go b/api.go
index a307e323d..19a433315 100644
--- a/api.go
+++ b/api.go
@@ -784,7 +784,7 @@ func (api *API) Node() *Node {
 
 // Usage gets the disk usage per index
 func (api *API) Usage() (map[string]int64, int64, error) {
-	indexSizes := make(map[string]int64, 0)
+	indexSizes := make(map[string]int64)
 	var totalSize int64
 
 	dirName, err := expandDirName(api.server.dataDir)