diff --git a/Makefile.builder b/Makefile.builder
index ecc662b..54c7119 100644
--- a/Makefile.builder
+++ b/Makefile.builder
@@ -1,3 +1,3 @@
-ifeq ($(PACKAGE_SET),dom0)
+ifneq ($(PACKAGE_SET),dom0)
 RPM_SPEC_FILES=qubes-network-server.spec
 endif