diff --git a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
index 1c8d936fc82..1ad6cfe3143 100644
--- a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
@@ -47,5 +47,21 @@
 "algorithm": "sha512", 
 "unpack": true,
 "filename": "genisoimage.tar.xz"
+},
+{
+"size": 60778437,
+"visibility": "public",
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+"algorithm": "sha512",
+"filename": "rust-std-lib.tar.bz2",
+"unpack": true
+},
+{
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+"visibility": "public",
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+"algorithm": "sha512",
+"filename": "rustc-linux64.tar.bz2",
+"unpack": true
 }
 ]