diff --git a/repbuild/src/main.rs b/repbuild/src/main.rs
index 5b0ca4f..f3f596e 100644
--- a/repbuild/src/main.rs
+++ b/repbuild/src/main.rs
@@ -120,7 +120,10 @@ fn run() -> Result<(), Error> {
 
     #[rustfmt::skip]
     com.args([
-        "-bios", "/usr/share/OVMF/OVMF_CODE.fd",
+        "-bios",
+            std::env::var("REPBUILD_QEMU_FIRMWARE_PATH")
+            .as_deref()
+            .unwrap_or("/usr/share/OVMF/OVMF_CODE.fd"),
         "-drive", "file=target/disk.img,format=raw",
         "-m", "4G",
         "-serial", "stdio",