diff --git a/tools/build/bazel/protobuf_workspace.bzl b/tools/build/bazel/protobuf_workspace.bzl
index e850eb6..bf7e62b 100644
--- a/tools/build/bazel/protobuf_workspace.bzl
+++ b/tools/build/bazel/protobuf_workspace.bzl
@@ -1,13 +1,13 @@
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+load("//tools/build/bazel:variables.bzl", "PROTOBUF_VERSION")
 
-PROTOBUF_VER = "3.6.1.3"
 SHA = "9510dd2afc29e7245e9e884336f848c8a6600a14ae726adb6befdb4f786f0be2"
 
 def generate_protobuf():
     http_archive(
         name = "com_google_protobuf",
         urls = ["https://github.com/protocolbuffers/protobuf/archive/v%s.zip" %
-                PROTOBUF_VER],
+                PROTOBUF_VERSION],
         sha256 = SHA,
-        strip_prefix = "protobuf-" + PROTOBUF_VER,
+        strip_prefix = "protobuf-" + PROTOBUF_VERSION,
     )