diff --git a/rpm_spec/core-dom0-linux.spec.in b/rpm_spec/core-dom0-linux.spec.in
index 7f9c491..7d4769f 100644
--- a/rpm_spec/core-dom0-linux.spec.in
+++ b/rpm_spec/core-dom0-linux.spec.in
@@ -72,6 +72,7 @@ Kernel install hook for Xen-based system.
 %setup -q
 
 %build
+export BACKEND_VMM=@BACKEND_VMM@
 (cd dom0-updates; make)
 (cd qrexec; make)
 (cd file-copy-vm; make)