diff --git a/include/grub/types.h b/include/grub/types.h
index 8e2ad15..50b253a 100644
--- a/include/grub/types.h
+++ b/include/grub/types.h
@@ -62,7 +62,7 @@
 typedef signed char		grub_int8_t;
 typedef short			grub_int16_t;
 typedef int			grub_int32_t;
-#if GRUB_CPU_SIZEOF_VOID_P == 8
+#if GRUB_CPU_SIZEOF_LONG == 8
 typedef long			grub_int64_t;
 #else
 typedef long long		grub_int64_t;
@@ -71,7 +71,7 @@ typedef long long		grub_int64_t;
 typedef unsigned char		grub_uint8_t;
 typedef unsigned short		grub_uint16_t;
 typedef unsigned		grub_uint32_t;
-#if GRUB_CPU_SIZEOF_VOID_P == 8
+#if GRUB_CPU_SIZEOF_LONG == 8
 typedef unsigned long		grub_uint64_t;
 #else
 typedef unsigned long long	grub_uint64_t;
@@ -100,7 +100,7 @@ typedef grub_uint32_t	grub_size_t;
 typedef grub_int32_t	grub_ssize_t;
 #endif
 
-#if GRUB_CPU_SIZEOF_VOID_P == 8
+#if GRUB_CPU_SIZEOF_LONG == 8
 # define GRUB_ULONG_MAX 18446744073709551615UL
 # define GRUB_LONG_MAX 9223372036854775807L
 # define GRUB_LONG_MIN (-9223372036854775807L - 1)