diff --git a/lib/fetch/ftp.c b/lib/fetch/ftp.c
index ca6d24dd..f40a51d0 100644
--- a/lib/fetch/ftp.c
+++ b/lib/fetch/ftp.c
@@ -140,7 +140,7 @@ unmappedaddr(struct sockaddr_in6 *sin6, socklen_t *len)
 	    !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 		return;
 	sin4 = (struct sockaddr_in *)sin6;
-	addr = *(uint32_t *)&sin6->sin6_addr.s6_addr[12];
+	addr = *(uint8_t *)&sin6->sin6_addr.s6_addr[12];
 	port = sin6->sin6_port;
 	memset(sin4, 0, sizeof(struct sockaddr_in));
 	sin4->sin_addr.s_addr = addr;