diff --git a/lib/core-net/client/conmon.c b/lib/core-net/client/conmon.c
index 6e252134c..68fc761f1 100644
--- a/lib/core-net/client/conmon.c
+++ b/lib/core-net/client/conmon.c
@@ -91,7 +91,7 @@ lws_conmon_append_copy_new_dns_results(struct lws *wsi,
 			 * No we don't already have a copy of this one, let's
 			 * allocate and append it then
 			 */
-			size_t al = sizeof(struct addrinfo) + cai->ai_addrlen;
+			size_t al = sizeof(struct addrinfo) + (size_t)cai->ai_addrlen;
 			size_t cl = cai->ai_canonname ?
 					strlen(cai->ai_canonname) + 1 : 0;
 
@@ -102,7 +102,7 @@ lws_conmon_append_copy_new_dns_results(struct lws *wsi,
 			}
 			*ai = *cai;
 			ai->ai_addr = (struct sockaddr *)&ai[1];
-			memcpy(ai->ai_addr, cai->ai_addr, cai->ai_addrlen);
+			memcpy(ai->ai_addr, cai->ai_addr, (size_t)cai->ai_addrlen);
 
 			if (cl) {
 				ai->ai_canonname = ((char *)ai->ai_addr) +
diff --git a/lib/core-net/client/connect3.c b/lib/core-net/client/connect3.c
index 1a7f9f97c..ec069f3f1 100644
--- a/lib/core-net/client/connect3.c
+++ b/lib/core-net/client/connect3.c
@@ -452,7 +452,7 @@ ads_known:
 	else
 #endif
 		m = connect(wsi->desc.sockfd, (const struct sockaddr *)psa,
-			    (unsigned int)n);
+			    (socklen_t)n);
 
 #if defined(LWS_WITH_CONMON)
 	wsi->conmon_datum = lws_now_usecs();
diff --git a/lib/core-net/client/sort-dns.c b/lib/core-net/client/sort-dns.c
index e802909a2..746969de6 100644
--- a/lib/core-net/client/sort-dns.c
+++ b/lib/core-net/client/sort-dns.c
@@ -634,7 +634,7 @@ lws_sort_dns(struct lws *wsi, const struct addrinfo *result)
 		if (!ds)
 			return 1;
 
-		memcpy(&ds->dest, ai->ai_addr, ai->ai_addrlen);
+		memcpy(&ds->dest, ai->ai_addr, (size_t)ai->ai_addrlen);
 		ds->dest.sa4.sin_family = (sa_family_t)ai->ai_family;
 
 		lws_sa46_write_numeric_address(&ds->dest, afip, sizeof(afip));
diff --git a/lib/plat/unix/unix-sockets.c b/lib/plat/unix/unix-sockets.c
index af8a69b8d..a2c0e0ac5 100644
--- a/lib/plat/unix/unix-sockets.c
+++ b/lib/plat/unix/unix-sockets.c
@@ -225,7 +225,8 @@ lws_plat_set_socket_options_ip(lws_sockfd_type fd, uint8_t pri, int lws_flags)
       !defined(__NetBSD__) && \
       !defined(__OpenBSD__) && \
       !defined(__sun) && \
-      !defined(__HAIKU__)
+      !defined(__HAIKU__) && \
+      !defined(__CYGWIN__)
 
 	/* the BSDs don't have SO_PRIORITY */