diff --git a/rtems/config/tools/rtems-kernel-4-1.cfg b/rtems/config/tools/rtems-kernel-4-1.cfg
index 1bd0c3e..70e48f2 100644
--- a/rtems/config/tools/rtems-kernel-4-1.cfg
+++ b/rtems/config/tools/rtems-kernel-4-1.cfg
@@ -50,8 +50,10 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
 #
 # It the rtems_bsps is all undefine it
 #
-%if %{rtems_bsps} == all
- %undefine rtems_bsps
+%if %{defined rtems_bsp}
+ %if %{rtems_bsps} == all
+  %undefine rtems_bsps
+ %endif
 %endif
 
 #