diff --git a/tools/migration/BUILD b/tools/migration/BUILD
index da0af7e..2ddd447 100644
--- a/tools/migration/BUILD
+++ b/tools/migration/BUILD
@@ -129,3 +129,5 @@
         "ctoolchain_compare.bzl",
     ],
 )
+
+exports_files(["ctoolchain_compare.bzl"])