diff --git a/mkosi.spec b/mkosi.spec
index 7852cca..a4b42e0 100644
--- a/mkosi.spec
+++ b/mkosi.spec
@@ -39,6 +39,7 @@ Recommends:     xz
 Recommends:     debootstrap >= 1.0.83
 Recommends:     dnf
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
+ExclusiveArch:  x86_64
 BuildArch:      noarch
 
 %description