diff --git a/metropolis/proto/api/BUILD.bazel b/metropolis/proto/api/BUILD.bazel
index 61d14fb..ef8885d 100644
--- a/metropolis/proto/api/BUILD.bazel
+++ b/metropolis/proto/api/BUILD.bazel
@@ -11,6 +11,7 @@
         "management.proto",
     ],
     visibility = ["//visibility:public"],
+    deps = ["//metropolis/proto/ext:ext_proto"],
 )
 
 go_proto_library(
@@ -19,6 +20,7 @@
     importpath = "source.monogon.dev/metropolis/proto/api",
     proto = ":api_proto",
     visibility = ["//visibility:public"],
+    deps = ["//metropolis/proto/ext:go_default_library"],
 )
 
 go_library(