diff --git a/tests/BUILD.bazel b/tests/BUILD.bazel
index 331a0691d..e871466d8 100644
--- a/tests/BUILD.bazel
+++ b/tests/BUILD.bazel
@@ -15,6 +15,7 @@ rust_test(
 
 rust_library(
     name = "cxx_test_suite",
+    testonly = True,
     srcs = [
         "ffi/cast.rs",
         "ffi/lib.rs",
@@ -25,11 +26,11 @@ rust_library(
         ":impl",
         "//:cxx",
     ],
-    testonly = True,
 )
 
 cc_library(
     name = "impl",
+    testonly = True,
     srcs = [
         "ffi/tests.cc",
         ":bridge/source",
@@ -41,19 +42,18 @@ cc_library(
         ":module/include",
         "//:core",
     ],
-    testonly = True,
 )
 
 rust_cxx_bridge(
     name = "bridge",
+    testonly = True,
     src = "ffi/lib.rs",
     deps = [":impl"],
-    testonly = True,
 )
 
 rust_cxx_bridge(
     name = "module",
+    testonly = True,
     src = "ffi/module.rs",
     deps = [":impl"],
-    testonly = True,
 )
diff --git a/tools/bazel/rust_cxx_bridge.bzl b/tools/bazel/rust_cxx_bridge.bzl
index e010e1d40..48aac83c5 100644
--- a/tools/bazel/rust_cxx_bridge.bzl
+++ b/tools/bazel/rust_cxx_bridge.bzl
@@ -14,13 +14,13 @@ def rust_cxx_bridge(name, src, deps = [], **kwargs):
     native.alias(
         name = "%s/header" % name,
         actual = src + ".h",
-        **kwargs,
+        **kwargs
     )
 
     native.alias(
         name = "%s/source" % name,
         actual = src + ".cc",
-        **kwargs,
+        **kwargs
     )
 
     run_binary(
@@ -38,18 +38,18 @@ def rust_cxx_bridge(name, src, deps = [], **kwargs):
             "$(location %s.cc)" % src,
         ],
         tool = "@cxx.rs//:codegen",
-        **kwargs,
+        **kwargs
     )
 
     cc_library(
         name = name,
         srcs = [src + ".cc"],
         deps = deps + [":%s/include" % name],
-        **kwargs,
+        **kwargs
     )
 
     cc_library(
         name = "%s/include" % name,
         hdrs = [src + ".h"],
-        **kwargs,
+        **kwargs
     )