diff --git a/headers/posix/net/if_dl.h b/headers/posix/net/if_dl.h
index 4b22d66321..14b891e1ac 100644
--- a/headers/posix/net/if_dl.h
+++ b/headers/posix/net/if_dl.h
@@ -20,7 +20,7 @@ struct sockaddr_dl {
 	uint8	sdl_nlen;     /* interface name length, no trailing 0 reqd. */
 	uint8	sdl_alen;     /* link level address length */
 	uint8	sdl_slen;     /* link layer selector length */
-	char	sdl_data[12]; /* minimum work area, can be larger;
+	char	sdl_data[24]; /* minimum work area, can be larger;
                                    contains both if name and ll address */
 };
 
diff --git a/headers/posix/netinet/in.h b/headers/posix/netinet/in.h
index c9efce8adc..84f0b91529 100644
--- a/headers/posix/netinet/in.h
+++ b/headers/posix/netinet/in.h
@@ -77,7 +77,7 @@ struct sockaddr_in {
 	uint8		sin_family;
 	uint16		sin_port;
 	struct in_addr 	sin_addr;
-	int8		sin_zero[8];
+	int8		sin_zero[24];
 };
 /* the address is therefore at sin_addr.s_addr */