diff --git a/arch/m68k/atari/config.c b/arch/m68k/atari/config.c
index bd96702a1ad0977334a31ea21d8c782c7ddf1f00..4fcc4b1df1c0f2b4d417a9ce96d29dc740755126 100644
--- a/arch/m68k/atari/config.c
+++ b/arch/m68k/atari/config.c
@@ -148,7 +148,7 @@ int __init atari_parse_bootinfo(const struct bi_record *record)
 /* Parse the Atari-specific switches= option. */
 static int __init atari_switches_setup(char *str)
 {
-	char switches[strlen(str) + 1];
+	char switches[COMMAND_LINE_SIZE];
 	char *p;
 	int ovsc_shift;
 	char *args = switches;