diff --git a/tests/test_instance_config.py b/tests/test_instance_config.py
index 53e98042..c8cf0bf7 100644
--- a/tests/test_instance_config.py
+++ b/tests/test_instance_config.py
@@ -1,4 +1,3 @@
-import os
 import sys
 
 import pytest
@@ -15,17 +14,6 @@ def test_explicit_instance_paths(modules_tmpdir):
     assert app.instance_path == str(modules_tmpdir)
 
 
-def test_main_module_paths(modules_tmpdir, purge_module):
-    app = modules_tmpdir.join("main_app.py")
-    app.write('import flask\n\napp = flask.Flask("__main__")')
-    purge_module("main_app")
-
-    from main_app import app
-
-    here = os.path.abspath(os.getcwd())
-    assert app.instance_path == os.path.join(here, "instance")
-
-
 def test_uninstalled_module_paths(modules_tmpdir, purge_module):
     app = modules_tmpdir.join("config_module_app.py").write(
         "import os\n"