diff --git a/modules/auth/user_form.go b/modules/auth/user_form.go
index b616a460f..d3d730677 100644
--- a/modules/auth/user_form.go
+++ b/modules/auth/user_form.go
@@ -107,7 +107,7 @@ func (f *AddEmailForm) Validate(ctx *macaron.Context, errs binding.Errors) bindi
 }
 
 type ChangePasswordForm struct {
-	OldPassword string `form:"old_password" binding:"Required;MinSize(6);MaxSize(255)"`
+	OldPassword string `form:"old_password" binding:"Required;MinSize(1);MaxSize(255)"`
 	Password    string `form:"password" binding:"Required;MinSize(6);MaxSize(255)"`
 	Retype      string `form:"retype"`
 }