diff --git a/fwupd.spec b/fwupd.spec
index e004fda..405b268 100644
--- a/fwupd.spec
+++ b/fwupd.spec
@@ -230,6 +230,7 @@ or server machines.
     -Dplugin_uefi_pk=enabled \
     -Dplugin_tpm=enabled \
     -Defi_binary=false \
+    -Defi_os_dir=%{efi_vendor} \
 %else
     -Dplugin_uefi_capsule=disabled \
     -Dplugin_uefi_pk=disabled \