diff --git a/scripts/kconfig/lex.zconf.c_shipped b/scripts/kconfig/lex.zconf.c_shipped
index b4792d344..5fc323de3 100644
--- a/scripts/kconfig/lex.zconf.c_shipped
+++ b/scripts/kconfig/lex.zconf.c_shipped
@@ -784,6 +784,11 @@ void new_string(void)
 void append_string(const char *str, int size)
 {
 	int new_size = text_size + size + 1;
+	if (size > 70) {
+		fprintf (stderr, "%s:%d error: Overlong line\n",
+		current_file->name, current_file->lineno);
+	}
+
 	if (new_size > text_asize) {
 		new_size += START_STRSIZE - 1;
 		new_size &= -START_STRSIZE;
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
index cfa46077c..d839577ca 100644
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/zconf.l
@@ -49,6 +49,10 @@ void new_string(void)
 void append_string(const char *str, int size)
 {
 	int new_size = text_size + size + 1;
+	if (size > 70) {
+	        fprintf (stderr, "%s:%d error: Overlong line\n",
+			 current_file->name, current_file->lineno);
+	}
 	if (new_size > text_asize) {
 		new_size += START_STRSIZE - 1;
 		new_size &= -START_STRSIZE;