--- src/io.c	2026-05-27 06:29:56.000000000 +0800
+++ src/io.c	2026-06-05 01:32:13.000000000 +0800
@@ -50,7 +50,7 @@
 
 #if defined(AVIF_USE_FSEEKO)
 // POSIX large file support
-static_assert(sizeof(off_t) == sizeof(int64_t), "");
+_Static_assert(sizeof(off_t) == sizeof(int64_t), "");
 typedef off_t avif_off_t;
 #define AVIF_OFF_MAX INT64_MAX