diff --git a/include/stddef.h b/include/stddef.h
index 536ebee3..aff5da35 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -17,12 +17,17 @@ typedef union { long long __ll; long double __ld; } max_align_t;
 typedef signed char int8_t;
 typedef signed short int int16_t;
 typedef signed int int32_t;
-typedef signed __INT64_TYPE__ int64_t;
 typedef unsigned char uint8_t;
 typedef unsigned short int uint16_t;
 typedef unsigned int uint32_t;
+#if defined(__LP64__) \
+  && !defined(__FreeBSD__) \
+  && !(defined(__NetBSD__) && defined(__aarch64__))
+typedef signed __INT64_TYPE__ int64_t;
 typedef unsigned __INT64_TYPE__ uint64_t;
 #endif
+#endif
+#endif
 
 #ifndef NULL
 #define NULL ((void*)0)