diff --git a/WORKSPACE b/WORKSPACE
index 9c477b2b43..9aff9c7c29 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -21,6 +21,7 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 # https://github.com/bazelbuild/bazel/issues/6664
 http_archive(
     name = "com_github_grpc_grpc",
+    sha256 = "d6277f77e0bb922d3f6f56c0f93292bb4cfabfc3c92b31ee5ccea0e100303612",
     strip_prefix = "grpc-1.28.0",
     urls = [
         "https://github.com/grpc/grpc/archive/v1.28.0.tar.gz",