diff --git a/lib/roles/h2/http2.c b/lib/roles/h2/http2.c
index a953a02f1..d819a0f5c 100644
--- a/lib/roles/h2/http2.c
+++ b/lib/roles/h2/http2.c
@@ -490,7 +490,7 @@ lws_h2_settings(struct lws *wsi, struct http2_settings *settings,
 					      "Frame size < initial");
 				return 1;
 			}
-			if (b > 0x007fffff) {
+			if (b > 0x00ffffff) {
 				lws_h2_goaway(nwsi, H2_ERR_PROTOCOL_ERROR,
 					      "Settings Frame size above max");
 				return 1;