diff --git a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/package.use b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/package.use
index abfbf871aa..824ab38268 100644
--- a/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/package.use
+++ b/sdk_container/src/third_party/coreos-overlay/profiles/coreos/base/package.use
@@ -95,3 +95,6 @@ net-misc/socat -ssl
 
 # Prevent pulling in a ton of perl dependencies
 sys-apps/man-db -nls
+
+# Always build the firmware from source.
+sys-firmware/edk2-ovmf -binary