diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/arm64/package.use.mask b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/arm64/package.use.mask
new file mode 100644
index 0000000000..91f11200ab
--- /dev/null
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/arm64/package.use.mask
@@ -0,0 +1,2 @@
+# This fails from -Werror=implicit-fallthrough, and it's disabled in the SDK.
+sys-devel/gcc sanitize