Index: vlc-3.0.2/modules/lua/libs/io.c
===================================================================
--- vlc-3.0.2.orig/modules/lua/libs/io.c
+++ vlc-3.0.2/modules/lua/libs/io.c
@@ -139,7 +139,7 @@ static int vlclua_io_file_seek( lua_Stat
     const char* psz_mode = luaL_optstring( L, 2, NULL );
     if ( psz_mode != NULL )
     {
-        long i_offset = luaL_optlong( L, 3, 0 );
+        long i_offset = (long) luaL_optinteger(L, 3, 0);
         int i_mode;
         if ( !strcmp( psz_mode, "set" ) )
             i_mode = SEEK_SET;