diff --git a/mkosi.conf.d/10-tools.conf b/mkosi.conf.d/10-tools.conf
index 21bdea58093..9d276d43c41 100644
--- a/mkosi.conf.d/10-tools.conf
+++ b/mkosi.conf.d/10-tools.conf
@@ -5,4 +5,4 @@ PathExists=!build/
 SystemdVersion=<254
 
 [Host]
-ToolsTree=default
+@ToolsTree=default