diff --git a/scripts/check-config.sh b/scripts/check-config.sh
index 583f7d0963..cc1c9a54d9 100755
--- a/scripts/check-config.sh
+++ b/scripts/check-config.sh
@@ -39,14 +39,14 @@ new_adhoc="${path}.adhoc"
 export LC_ALL=C
 export LC_COLLATE=C
 
-cat ${path} |sed -n 's/^#define \(CONFIG_[A-Za-z0-9_]*\).*/\1/p' |sort |uniq \
+cat ${path} |sed -nr 's/^#define (CONFIG_[A-Za-z0-9_]*).*/\1/p' |sort |uniq \
 	>${configs}
 
 comm -23 ${configs} ${whitelist} > ${suspects}
 
-cat `find ${srctree} -name "Kconfig*"` |sed -n \
-	-e 's/^\s*config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
-	-e 's/^\s*menuconfig \([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+cat `find ${srctree} -name "Kconfig*"` |sed -nr \
+	-e 's/^[[:blank:]]*config *([A-Za-z0-9_]*).*$/CONFIG_\1/p' \
+	-e 's/^[[:blank:]]*menuconfig ([A-Za-z0-9_]*).*$/CONFIG_\1/p' \
 	|sort |uniq > ${ok}
 comm -23 ${suspects} ${ok} >${new_adhoc}
 if [ -s ${new_adhoc} ]; then