diff --git a/headers/posix/net/if.h b/headers/posix/net/if.h
index 868657a3a4..fdeff5d579 100644
--- a/headers/posix/net/if.h
+++ b/headers/posix/net/if.h
@@ -109,8 +109,8 @@ struct ifconf {
 /* Macro that returns the size of a single address within a SIOCGIFCONF buffer;
    it looks like this because of compatibility with other platforms. */
 #define _SIZEOF_ADDR_IFREQ(request) \
-	(IF_NAMESIZE + (request).ifr_addr.sa_len > (int)sizeof(ifreq) \
-		? IF_NAMESIZE + (request).ifr_addr.sa_len : sizeof(ifreq))
+	(IF_NAMESIZE + (request).ifr_addr.sa_len > (int)sizeof(struct ifreq) \
+		? IF_NAMESIZE + (request).ifr_addr.sa_len : sizeof(struct ifreq))
 
 
 /* POSIX definitions follow */