diff --git a/subjects/btreeisbinary.md b/subjects/btreeisbinary.md
index c9cfe7a0c..f17153a7c 100644
--- a/subjects/btreeisbinary.md
+++ b/subjects/btreeisbinary.md
@@ -22,8 +22,8 @@ Here is a possible [program](TODO-LINK) to test your function :
 package main
 
 import (
-  "fmt"
-  student ".."
+	"fmt"
+	student ".."
 )
 
 func main() {