diff --git a/udftools.spec b/udftools.spec
index 87d3186..1d0438a 100644
--- a/udftools.spec
+++ b/udftools.spec
@@ -25,7 +25,7 @@ Linux UDF Filesystem userspace utilities.
 
 %build
 %configure
-%{__make} %{_smp_mflags}
+%{__make} %{?_smp_mflags}
 
 
 %install