diff --git a/rtems/config/tools/rtems-kernel-4.11.cfg b/rtems/config/tools/rtems-kernel-4.11.cfg
index f97035a..a0d1d0d 100644
--- a/rtems/config/tools/rtems-kernel-4.11.cfg
+++ b/rtems/config/tools/rtems-kernel-4.11.cfg
@@ -5,7 +5,7 @@
 #
 # Optionally disable building the RTEMS kernel via the command line.
 #
-%if %{without_rtems}
+%if %{defined without_rtems}
  %define rtems_kernel_build 0
 %else
  %define rtems_kernel_build 1