diff --git a/metropolis/pkg/pki/BUILD.bazel b/metropolis/pkg/pki/BUILD.bazel
index c215ce2..547d733 100644
--- a/metropolis/pkg/pki/BUILD.bazel
+++ b/metropolis/pkg/pki/BUILD.bazel
@@ -5,6 +5,7 @@
     srcs = [
         "ca.go",
         "certificate.go",
+        "testhelpers.go",
         "x509.go",
     ],
     importpath = "source.monogon.dev/metropolis/pkg/pki",