diff --git a/metropolis/test/ktest/ktest.bzl b/metropolis/test/ktest/ktest.bzl
index 2462603..62cbd3a 100644
--- a/metropolis/test/ktest/ktest.bzl
+++ b/metropolis/test/ktest/ktest.bzl
@@ -29,6 +29,9 @@
 def ktest(tester, cmdline = "", files = {}, files_cc = {}):
     node_initramfs(
         name = "test_initramfs",
+        fsspecs = [
+            "//metropolis/node/build:earlydev.fsspec",
+        ],
         files = _dict_union({
             "//metropolis/test/ktest/init": "/init",
             tester: "/tester",
diff --git a/metropolis/test/nanoswitch/BUILD b/metropolis/test/nanoswitch/BUILD
index ce22acd..74f2ddf 100644
--- a/metropolis/test/nanoswitch/BUILD
+++ b/metropolis/test/nanoswitch/BUILD
@@ -37,5 +37,8 @@
         # CA Certificate bundle
         "@cacerts//file": "/etc/ssl/cert.pem",
     },
+    fsspecs = [
+        "//metropolis/node/build:earlydev.fsspec",
+    ],
     visibility = ["//metropolis/test:__subpackages__"],
 )