diff --git a/lib/client-handshake.c b/lib/client-handshake.c
index e7b33b64..49a31bca 100644
--- a/lib/client-handshake.c
+++ b/lib/client-handshake.c
@@ -55,7 +55,7 @@ libwebsocket_client_connect(struct libwebsocket_context *this,
 	/* -1 means just use latest supported */
 
 	if (ietf_version_or_minus_one == -1)
-		ietf_version_or_minus_one = 5;
+		ietf_version_or_minus_one = SPEC_LATEST_SUPPORTED;
 
 	wsi->ietf_spec_revision = ietf_version_or_minus_one;
 	wsi->name_buffer_pos = 0;
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 493fd221..e876870b 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -89,6 +89,7 @@ static inline void debug(const char *format, ...)
 #define MAX_USER_RX_BUFFER 4096
 #define MAX_BROADCAST_PAYLOAD 2048
 #define LWS_MAX_PROTOCOLS 10
+#define SPEC_LATEST_SUPPORTED 6
 
 #define MAX_WEBSOCKET_04_KEY_LEN 128
 #define SYSTEM_RANDOM_FILEPATH "/dev/urandom"