diff --git a/proto/connectrpc/conformance/BUILD.bazel b/proto/connectrpc/conformance/BUILD.bazel
index 11156b6d..8eee70eb 100644
--- a/proto/connectrpc/conformance/BUILD.bazel
+++ b/proto/connectrpc/conformance/BUILD.bazel
@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+package(default_visibility = ["//visibility:public"])
+
 proto_library(
     name = "messages",
     srcs = ["messages.proto"],