diff --git a/mkosi.conf.d/20-extra-search-path.conf b/mkosi.conf.d/20-extra-search-path.conf
new file mode 100644
index 0000000000..b7308f7f21
--- /dev/null
+++ b/mkosi.conf.d/20-extra-search-path.conf
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Match]
+PathExists=build/
+
+[Build]
+ExtraSearchPaths=build/