diff --git a/boulder/src/draft.rs b/boulder/src/draft.rs
index b6a8a6aba..bd95c67fd 100644
--- a/boulder/src/draft.rs
+++ b/boulder/src/draft.rs
@@ -54,9 +54,7 @@ impl Drafter {
         // Remove temp extract dir
         fs::remove_dir_all(extract_root)?;
 
-        let Some(build_system) = build.detected_system else {
-            return Err(Error::UnhandledBuildSystem);
-        };
+        let build_system = build.detected_system.unwrap_or(build::System::Autotools);
 
         let builddeps = builddeps(build.dependencies);
         let environment = build_system