diff --git a/artiq/firmware/Cargo.lock b/artiq/firmware/Cargo.lock
index 4e7c9b6fd..a97b6db38 100644
--- a/artiq/firmware/Cargo.lock
+++ b/artiq/firmware/Cargo.lock
@@ -52,6 +52,7 @@ version = "0.0.0"
 dependencies = [
  "alloc_none 0.0.0",
  "board 0.0.0",
+ "build_artiq 0.0.0",
  "byteorder 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "std_artiq 0.0.0",
 ]
diff --git a/artiq/firmware/libksupport/Cargo.toml b/artiq/firmware/libksupport/Cargo.toml
index be23c936f..ab47557f4 100644
--- a/artiq/firmware/libksupport/Cargo.toml
+++ b/artiq/firmware/libksupport/Cargo.toml
@@ -9,6 +9,9 @@ name = "ksupport"
 path = "lib.rs"
 crate-type = ["staticlib"]
 
+[build-dependencies]
+build_artiq = { path = "../libbuild_artiq" }
+
 [dependencies]
 alloc_none = { path = "../liballoc_none" }
 std_artiq = { path = "../libstd_artiq" }
diff --git a/artiq/firmware/libksupport/build.rs b/artiq/firmware/libksupport/build.rs
index 302f197c9..e39d723a5 100644
--- a/artiq/firmware/libksupport/build.rs
+++ b/artiq/firmware/libksupport/build.rs
@@ -1,17 +1,6 @@
-use std::env;
-use std::path::Path;
-use std::io::{BufRead, BufReader};
-use std::fs::File;
+extern crate build_artiq;
 
 fn main() {
-    let out_dir = env::var("BUILDINC_DIRECTORY").unwrap();
-    let cfg_path = Path::new(&out_dir).join("generated").join("rust-cfg");
-    println!("cargo:rerun-if-changed={}", cfg_path.to_str().unwrap());
-
-    let f = BufReader::new(File::open(&cfg_path).unwrap());
-    for line in f.lines() {
-        println!("cargo:rustc-cfg={}", line.unwrap());
-    }
-
+    build_artiq::misoc_registers();
     println!("cargo:rustc-cfg={}", "ksupport");
 }