diff --git a/tests/check_builtin_literals_test.py b/tests/check_builtin_literals_test.py
index 01193e8..e936798 100644
--- a/tests/check_builtin_literals_test.py
+++ b/tests/check_builtin_literals_test.py
@@ -131,19 +131,19 @@
 def test_failing_file(tmpdir):
     f = tmpdir.join('f.py')
     f.write(BUILTIN_CONSTRUCTORS)
-    rc = main([f.strpath])
+    rc = main([str(f)])
     assert rc == 1
 
 
 def test_passing_file(tmpdir):
     f = tmpdir.join('f.py')
     f.write(BUILTIN_LITERALS)
-    rc = main([f.strpath])
+    rc = main([str(f)])
     assert rc == 0
 
 
 def test_failing_file_ignore_all(tmpdir):
     f = tmpdir.join('f.py')
     f.write(BUILTIN_CONSTRUCTORS)
-    rc = main(['--ignore=complex,dict,float,int,list,str,tuple', f.strpath])
+    rc = main(['--ignore=complex,dict,float,int,list,str,tuple', str(f)])
     assert rc == 0