diff --git a/libretro/libretro.c b/libretro/libretro.c
index 4c79086..42c72c6 100644
--- a/libretro/libretro.c
+++ b/libretro/libretro.c
@@ -486,7 +486,7 @@ void retro_get_system_info(struct retro_system_info* info)
    info->library_version = "v0.91" GIT_VERSION;
    info->need_fullpath = true;
    info->block_extract = false;
-   info->valid_extensions = "gba|bin|agb|gbz" ;
+   info->valid_extensions = "gba|bin|agb|gbz|u1" ;
 }