diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index deb97723c890..ef158bd0ea7b 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -305,7 +305,7 @@ static void __init setup_zfcpdump(void)
 		return;
 	if (oldmem_data.start)
 		return;
-	strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
+	strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
 	console_loglevel = 2;
 }
 #else