diff --git a/scripts/Makefile.autoconf b/scripts/Makefile.autoconf
index 8a3efdb..5ed9abc 100644
--- a/scripts/Makefile.autoconf
+++ b/scripts/Makefile.autoconf
@@ -67,7 +67,8 @@
 quiet_cmd_u_boot_cfg = CFG     $@
       cmd_u_boot_cfg = \
 	$(CPP) $(c_flags) $2 -DDO_DEPS_ONLY -dM $(srctree)/include/common.h > $@.tmp && { \
-		grep 'define CONFIG_' $@.tmp > $@;			\
+		grep 'define CONFIG_' $@.tmp | \
+			sed '/define CONFIG_IS_ENABLED(/d;/define CONFIG_VAL(/d;' > $@; \
 		rm $@.tmp;						\
 	} || {								\
 		rm $@.tmp; false;					\