diff --git a/libc/include/netinet/in6.h b/libc/include/netinet/in6.h
index 879ac75..ae20f83 100644
--- a/libc/include/netinet/in6.h
+++ b/libc/include/netinet/in6.h
@@ -29,33 +29,34 @@
 #ifndef _NETINET_IN6_H
 #define _NETINET_IN6_H
 
+#include <sys/cdefs.h>
+
 #include <linux/in6.h>
 
 #define IN6_IS_ADDR_UNSPECIFIED(a) \
-  ((*(const uint32_t*)(&(a)->s6_addr[0]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[4]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[8]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[12]) == 0))
+  ((((a)->s6_addr32[0]) == 0) && \
+   (((a)->s6_addr32[1]) == 0) && \
+   (((a)->s6_addr32[2]) == 0) && \
+   (((a)->s6_addr32[3]) == 0))
 
 #define IN6_IS_ADDR_LOOPBACK(a) \
-  ((*(const uint32_t*)(&(a)->s6_addr[0]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[4]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[8]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[12]) == ntohl(1)))
+  ((((a)->s6_addr32[0]) == 0) && \
+   (((a)->s6_addr32[1]) == 0) && \
+   (((a)->s6_addr32[2]) == 0) && \
+   (((a)->s6_addr32[3]) == ntohl(1)))
 
 #define IN6_IS_ADDR_V4COMPAT(a) \
-  ((*(const uint32_t*)(&(a)->s6_addr[0]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[4]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[8]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[12]) != 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[12]) != ntohl(1)))
+  ((((a)->s6_addr32[0]) == 0) && \
+   (((a)->s6_addr32[1]) == 0) && \
+   (((a)->s6_addr32[2]) == 0) && \
+   (((a)->s6_addr32[3]) != 0) && (((a)->s6_addr32[3]) != ntohl(1)))
 
 #define IN6_IS_ADDR_V4MAPPED(a) \
-  ((*(const uint32_t*)(&(a)->s6_addr[0]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[4]) == 0) && \
-   (*(const uint32_t*)(&(a)->s6_addr[8]) == ntohl(0x0000ffff)))
+  ((((a)->s6_addr32[0]) == 0) && \
+   (((a)->s6_addr32[1]) == 0) && \
+   (((a)->s6_addr32[2]) == ntohl(0x0000ffff)))
 
-#define __bionic_s6_addr(a) ((const uint8_t*)(a))
+#define __bionic_s6_addr(a) __BIONIC_CAST(reinterpret_cast, const uint8_t*, a)
 
 #define IN6_IS_ADDR_LINKLOCAL(a) \
   ((__bionic_s6_addr(a)[0] == 0xfe) && ((__bionic_s6_addr(a)[1] & 0xc0) == 0x80))