diff --git a/examples/ffi/c_calling_rust/BUILD b/examples/ffi/c_calling_rust/BUILD
index a7847db50c..c00703c758 100644
--- a/examples/ffi/c_calling_rust/BUILD
+++ b/examples/ffi/c_calling_rust/BUILD
@@ -1,19 +1,21 @@
+package(default_visibility = ["//visibility:private"])
+
 load("@//rust:rust.bzl", "rust_library", "rust_test", "rust_binary")
 
 rust_library(
     name = "rusty",
+    srcs = ["lib.rs"],
     crate_type = "staticlib",
-    srcs = ["lib.rs"]
 )
 
 # cc_* rules expect cc_* deps, so we need to wrap our rust staticlib.
 cc_library(
     name = "wrapper",
-    srcs = [":rusty"]
+    srcs = [":rusty"],
 )
 
 cc_test(
     name = "main",
     srcs = ["main.c"],
-    deps = [":wrapper"]
+    deps = [":wrapper"],
 )