diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 92a4f7b..b21444b 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -100,7 +100,8 @@
 	int "Maximum number of CPUs (2-64)"
 	range 2 64
 	depends on SMP
-	default "32"
+	default "32" if !64BIT
+	default "64" if 64BIT
 	help
 	  This allows you to specify the maximum number of CPUs which this
 	  kernel will support.  The maximum supported value is 64 and the