diff --git a/shim/folly/io/async/test/certs/defs.bzl b/shim/folly/io/async/test/certs/defs.bzl
new file mode 100644
index 00000000..6031fcc1
--- /dev/null
+++ b/shim/folly/io/async/test/certs/defs.bzl
@@ -0,0 +1,16 @@
+load("@fbcode_macros//build_defs:native_rules.bzl", "alias")
+
+def alias_pem(pems: list[str]):
+    for pem in pems:
+        alias(
+            name = pem,
+            actual = "//folly/io/async/test/certs:{pem}".format(pem = pem),
+        )
+
+def alias_pem_for_xplat(pems: list[str]):
+    # in xplat these pem files are exported in //xplat/folly/io/async/test
+    for pem in pems:
+        alias(
+            name = pem,
+            actual = "//xplat/folly/io/async/test:certs/{pem}".format(pem = pem),
+        )