diff --git a/drivers/misc/kgdbts.c b/drivers/misc/kgdbts.c
index 59c118c19a910e9950a04a069dacf62352a25e9a..27dc463097f37c5e75a3f5859e8f82c65193f81f 100644
--- a/drivers/misc/kgdbts.c
+++ b/drivers/misc/kgdbts.c
@@ -988,7 +988,7 @@ static void kgdbts_run_tests(void)
 
 static int kgdbts_option_setup(char *opt)
 {
-	if (strlen(opt) > MAX_CONFIG_LEN) {
+	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		printk(KERN_ERR "kgdbts: config string too long\n");
 		return -ENOSPC;
 	}
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 25a8bc565f400b62c155dd31bb39ff08e8d85dd0..87e7e6c876d4b857aacea79feab04bf3c5d04953 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -131,7 +131,7 @@ static void kgdboc_unregister_kbd(void)
 
 static int kgdboc_option_setup(char *opt)
 {
-	if (strlen(opt) > MAX_CONFIG_LEN) {
+	if (strlen(opt) >= MAX_CONFIG_LEN) {
 		printk(KERN_ERR "kgdboc: config string too long\n");
 		return -ENOSPC;
 	}