diff --git a/firefox.spec b/firefox.spec
index 4d33f71..7e83aa7 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -514,6 +514,8 @@ echo 'export NODEJS="%{_buildrootdir}/bin/node-stdout-nonblocking-wrapper"' >> .
 chmod -x third_party/rust/itertools/src/lib.rs
 chmod a-x third_party/rust/gfx-backend-vulkan/src/*.rs
 chmod a-x third_party/rust/gfx-hal/src/*.rs
+chmod a-x third_party/rust/ash/src/extensions/ext/*.rs
+chmod a-x third_party/rust/ash/src/extensions/khr/*.rs
 
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