diff --git a/nbdkit.spec b/nbdkit.spec
index 2b32649..276267a 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -331,9 +331,8 @@ This package lets you write Ruby plugins for %{name}.
 %package plugin-tar
 Summary:        Tar archive plugin for %{name}
 License:        BSD
-BuildArch:      noarch
 
-Requires:       %{name} = %{version}-%{release}
+Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 
 %description plugin-tar