diff --git a/tensorflow_federated/python/common_libs/BUILD b/tensorflow_federated/python/common_libs/BUILD
index 3180038eec27106ae1d49ac93db83aeffacd3913..0e54233984af03a764e9afd3a373ff04ec89c358 100644
--- a/tensorflow_federated/python/common_libs/BUILD
+++ b/tensorflow_federated/python/common_libs/BUILD
@@ -68,7 +68,7 @@ py_test(
 
 py_library(
     name = "test",
-    testonly = 1,
+    testonly = True,
     srcs = ["test.py"],
 )