diff --git a/src/testdir/test_lua.vim b/src/testdir/test_lua.vim
index 2f9e21f..81e9262 100644
--- a/src/testdir/test_lua.vim
+++ b/src/testdir/test_lua.vim
@@ -616,10 +616,10 @@
 func Test_lua_blob()
   call assert_equal(0z, luaeval('vim.blob("")'))
   call assert_equal(0z31326162, luaeval('vim.blob("12ab")'))
-  call assert_equal(0z00010203, luaeval('vim.blob("\x00\x01\x02\x03")'))
-  call assert_equal(0z8081FEFF, luaeval('vim.blob("\x80\x81\xfe\xff")'))
+  call assert_equal(0z00010203, luaeval('vim.blob("\000\001\002\003")'))
+  call assert_equal(0z8081FEFF, luaeval('vim.blob("\128\129\254\255")'))
 
-  lua b = vim.blob("\x00\x00\x00\x00")
+  lua b = vim.blob("\000\000\000\000")
   call assert_equal(0z00000000, luaeval('b'))
   call assert_equal(4, luaeval('#b'))
   lua b[0], b[1], b[2], b[3] = 1, 32, 256, 0xff