diff --git a/pkgs/applications/virtualization/OVMF/default.nix b/pkgs/applications/virtualization/OVMF/default.nix
index f9ecceb226de..ff014dc0aa5a 100644
--- a/pkgs/applications/virtualization/OVMF/default.nix
+++ b/pkgs/applications/virtualization/OVMF/default.nix
@@ -253,6 +253,7 @@ edk2.mkDerivation projectDscPath (finalAttrs: {
       prefix = "${finalAttrs.finalPackage.fd}/FV/${fwPrefix}";
     in
     {
+      mergedFirmware = "${prefix}.fd";
       firmware = "${prefix}_CODE.fd";
       variables = "${prefix}_VARS.fd";
       variablesMs =
diff --git a/pkgs/build-support/xen/default.nix b/pkgs/build-support/xen/default.nix
index ebeb8b98d4ca..f5d127c15796 100644
--- a/pkgs/build-support/xen/default.nix
+++ b/pkgs/build-support/xen/default.nix
@@ -171,7 +171,7 @@ stdenv.mkDerivation (finalAttrs: {
     "--disable-qemu-traditional"
     "--with-system-qemu"
     (if withSeaBIOS then "--with-system-seabios=${systemSeaBIOS.firmware}" else "--disable-seabios")
-    (if withOVMF then "--with-system-ovmf=${OVMF.firmware}" else "--disable-ovmf")
+    (if withOVMF then "--with-system-ovmf=${OVMF.mergedFirmware}" else "--disable-ovmf")
     (if withIPXE then "--with-system-ipxe=${ipxe.firmware}" else "--disable-ipxe")
     (enableFeature withFlask "xsmpolicy")
   ];