diff --git a/doc/Changelog b/doc/Changelog
index 439c0a215..140408c17 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -9,6 +9,7 @@
 	  implemented causing TCP to fail. The fix allows fallback to regular
 	  TCP in this case and is also more robust for cases where connectx()
 	  fails for some reason.
+	- Fix #1402: squelch invalid argument error for fd_set_block on windows.
 
 10 August 2017: Wouter
 	- Patch to show DNSCrypt status in help output, from Carsten
diff --git a/util/net_help.c b/util/net_help.c
index 943f9dd7f..ce136a337 100644
--- a/util/net_help.c
+++ b/util/net_help.c
@@ -114,8 +114,9 @@ fd_set_block(int s)
 #elif defined(HAVE_IOCTLSOCKET)
 	unsigned long off = 0;
 	if(ioctlsocket(s, FIONBIO, &off) != 0) {
-		log_err("can't ioctlsocket FIONBIO off: %s", 
-			wsa_strerror(WSAGetLastError()));
+		if(WSAGetLastError() != WSAEINVAL || verbosity >= 4)
+			log_err("can't ioctlsocket FIONBIO off: %s", 
+				wsa_strerror(WSAGetLastError()));
 	}
 #endif	
 	return 1;