diff --git a/lib/context.c b/lib/context.c
index cb0fbbf1..757fdd34 100644
--- a/lib/context.c
+++ b/lib/context.c
@@ -100,6 +100,7 @@ lws_create_context(struct lws_context_creation_info *info)
 
 	lwsl_info(" SPEC_LATEST_SUPPORTED: %u\n", SPEC_LATEST_SUPPORTED);
 	lwsl_info(" AWAITING_TIMEOUT: %u\n", AWAITING_TIMEOUT);
+	lwsl_info(" sizeof (*info): %u\n", sizeof(*info));
 #if LWS_POSIX
 	lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
 	lwsl_info(" LWS_MAX_ZLIB_CONN_BUFFER: %u\n", LWS_MAX_ZLIB_CONN_BUFFER);
diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h
index 35361252..4855cd91 100644
--- a/lib/libwebsockets.h
+++ b/lib/libwebsockets.h
@@ -1278,7 +1278,14 @@ struct lws_context_creation_info {
 #endif
 
 	/* Add new things just above here ---^
-	 * This is part of the ABI, don't needlessly break compatibilty */
+	 * This is part of the ABI, don't needlessly break compatibility
+	 *
+	 * The below is to ensure later library versions with new
+	 * members added above will see 0 (default) even if the app
+	 * was not built against the newer headers.
+	 */
+
+	void *_unused[9];
 };
 
 LWS_VISIBLE LWS_EXTERN void