diff --git a/metropolis/installer/test/BUILD.bazel b/metropolis/installer/test/BUILD.bazel
index 59c5803..c958ac2 100644
--- a/metropolis/installer/test/BUILD.bazel
+++ b/metropolis/installer/test/BUILD.bazel
@@ -34,7 +34,7 @@
 efi_unified_kernel_image(
     name = "kernel",
     cmdline = "loglevel=0 console=ttyS0",
-    initramfs = "//metropolis/installer:initramfs",
+    initrd = ["//metropolis/installer:initramfs"],
     kernel = "//third_party/linux",
     visibility = ["//visibility:private"],
 )