diff --git a/repos/os/include/net/ipv4.h b/repos/os/include/net/ipv4.h
index 3e71265905..8ebaac33d1 100644
--- a/repos/os/include/net/ipv4.h
+++ b/repos/os/include/net/ipv4.h
@@ -43,7 +43,8 @@ struct Net::Ipv4_address : Network_address<IPV4_ADDR_LEN, '.', false>
 	Ipv4_address(void *src) : Network_address(src) { }
 
 	bool valid() const { return *this != Ipv4_address(); }
-};
+}
+__attribute__((packed));
 
 
 /**
diff --git a/repos/os/include/net/netaddress.h b/repos/os/include/net/netaddress.h
index 9ec7375601..e94852f68a 100644
--- a/repos/os/include/net/netaddress.h
+++ b/repos/os/include/net/netaddress.h
@@ -80,6 +80,7 @@ struct Net::Network_address
 
 	bool operator!=(const Network_address &other) const {
 		return !(*this == other); }
-};
+}
+__attribute__((packed));
 
 #endif /* _NET__NETADDRESS_H_ */