diff --git a/sdk_container/src/third_party/coreos-overlay/sys-boot/shim-signed/shim-signed-15.8.ebuild b/sdk_container/src/third_party/coreos-overlay/sys-boot/shim-signed/shim-signed-15.8.ebuild
index 1f34afc6302..1509bdf47c2 100644
--- a/sdk_container/src/third_party/coreos-overlay/sys-boot/shim-signed/shim-signed-15.8.ebuild
+++ b/sdk_container/src/third_party/coreos-overlay/sys-boot/shim-signed/shim-signed-15.8.ebuild
@@ -5,7 +5,7 @@ EAPI=8
 
 DESCRIPTION="Signed UEFI Shim loader"
 HOMEPAGE="https://github.com/rhboot/shim"
-SRC_URI="amd64? https://mirror.release.flatcar-linux.net/coreos/shimx64-${PV}.efi.signed"
+SRC_URI="amd64? ( https://mirror.release.flatcar-linux.net/coreos/shimx64-${PV}.efi.signed )"
 S=${WORKDIR}
 KEYWORDS="amd64 arm64"