diff --git a/kythe/cxx/verifier/BUILD b/kythe/cxx/verifier/BUILD
index 54c62d998c..8ddaf342af 100644
--- a/kythe/cxx/verifier/BUILD
+++ b/kythe/cxx/verifier/BUILD
@@ -46,6 +46,7 @@ cc_library(
         "@com_github_google_glog//:glog",
         "@com_google_absl//absl/memory",
         "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/types:optional",
         "@com_googlesource_code_re2//:re2",
     ],
 )