diff --git a/test/unit/tempfile_spec.lua b/test/unit/tempfile_spec.lua
index 210518fe1f..c05abfd640 100644
--- a/test/unit/tempfile_spec.lua
+++ b/test/unit/tempfile_spec.lua
@@ -62,7 +62,7 @@ describe('tempfile related functions', function()
     itp('generate file name in Neovim own temp directory', function()
       local dir = vim_gettempdir()
       local file = vim_tempname()
-      assert.truthy(file:find('^' .. dir .. '[^/]*$'))
+      eq(string.sub(file, 1, string.len(dir)), dir)
     end)
   end)
 end)