diff --git a/artiq/firmware/libksupport/build.rs b/artiq/firmware/libksupport/build.rs
index e39d723a5..6f802af66 100644
--- a/artiq/firmware/libksupport/build.rs
+++ b/artiq/firmware/libksupport/build.rs
@@ -1,6 +1,6 @@
 extern crate build_artiq;
 
 fn main() {
-    build_artiq::misoc_registers();
+    build_artiq::misoc_cfg();
     println!("cargo:rustc-cfg={}", "ksupport");
 }