diff --git a/tpl/os/init.go b/tpl/os/init.go
index 08a36fe7b..b11e742eb 100644
--- a/tpl/os/init.go
+++ b/tpl/os/init.go
@@ -58,7 +58,7 @@ func init() {
 		ns.AddMethodMapping(ctx.FileStat,
 			[]string{"fileStat"},
 			[][2]string{
-				{`{{ (fileExists "files/README.txt").Size }}`, `11`},
+				{`{{ (fileStat "files/README.txt").Size }}`, `11`},
 			},
 		)