diff --git a/arch/s390/include/asm/facility.h b/arch/s390/include/asm/facility.h
index 09b406db7529a34b62671b659c44ed895e7b9d19..aead78b5da7efd565f971ec98cec67b6d19978bc 100644
--- a/arch/s390/include/asm/facility.h
+++ b/arch/s390/include/asm/facility.h
@@ -15,7 +15,7 @@
 #include <linux/preempt.h>
 #include <asm/lowcore.h>
 
-#define MAX_FACILITY_BIT (256*8)	/* stfle_fac_list has 256 bytes */
+#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
 
 static inline int __test_facility(unsigned long nr, void *facilities)
 {