diff --git a/fontbe/src/paths.rs b/fontbe/src/paths.rs
index 9ea6d0730..c9e4327f0 100644
--- a/fontbe/src/paths.rs
+++ b/fontbe/src/paths.rs
@@ -65,7 +65,7 @@ impl Paths {
     pub fn target_file(&self, id: &WorkId) -> PathBuf {
         match id {
             WorkId::Features => self.build_dir.join("features.marker"),
-            WorkId::FeaturesAst => self.build_dir.join("features_ast.marker"),
+            WorkId::FeaturesAst => self.build_dir.join("features_ast.bin"),
             WorkId::GlyfFragment(name) => self.glyph_glyf_file(name.as_str()),
             WorkId::GvarFragment(name) => self.glyph_gvar_file(name.as_str()),
             WorkId::Avar => self.build_dir.join("avar.table"),