diff --git a/tools/Unix.mk b/tools/Unix.mk
index 90d90263d9..38868bca1d 100644
--- a/tools/Unix.mk
+++ b/tools/Unix.mk
@@ -648,7 +648,7 @@ else
                               rm kwarning; \
                           fi
   MODULE_WARNING        = "warning: the 'modules' option is not supported"
-  PURGE_MODULE_WARNING  = 2> >(grep -v ${MODULE_WARNING} | tee kwarning) && ${KCONFIG_WARNING}
+  PURGE_MODULE_WARNING  = 2>&1 >/dev/null | grep -v ${MODULE_WARNING} | tee kwarning && ${KCONFIG_WARNING}
   KCONFIG_OLDCONFIG     = oldconfig ${PURGE_MODULE_WARNING}
   KCONFIG_OLDDEFCONFIG  = olddefconfig ${PURGE_MODULE_WARNING}
   KCONFIG_MENUCONFIG    = menuconfig ${PURGE_MODULE_WARNING}