diff --git a/test/cpp/interop/BUILD b/test/cpp/interop/BUILD
index d1461503ec2..1a3e8d916fa 100644
--- a/test/cpp/interop/BUILD
+++ b/test/cpp/interop/BUILD
@@ -39,6 +39,7 @@ cc_library(
     ],
     deps = [
         "//test/cpp/util:test_util",
+        "//external:gflags",
     ],
 )