diff --git a/metropolis/proto/api/BUILD.bazel b/metropolis/proto/api/BUILD.bazel
index b732f18..5bc5640 100644
--- a/metropolis/proto/api/BUILD.bazel
+++ b/metropolis/proto/api/BUILD.bazel
@@ -14,6 +14,7 @@
     deps = [
         "//metropolis/proto/common:common_proto",
         "//metropolis/proto/ext:ext_proto",
+        "@com_google_protobuf//:duration_proto",
     ],
 )