diff --git a/arch/x86_64/bits/posix.h b/arch/x86_64/bits/posix.h
index 30a38714..d9f01fd9 100644
--- a/arch/x86_64/bits/posix.h
+++ b/arch/x86_64/bits/posix.h
@@ -1,2 +1,2 @@
-#define _POSIX_V6_ILP32_OFFBIG  1
-#define _POSIX_V7_ILP32_OFFBIG  1
+#define _POSIX_V6_LP64_OFF64  1
+#define _POSIX_V6_LP64_OFF64  1