diff --git a/tools/readme_generator/tests/test_make_readme.py b/tools/readme_generator/tests/test_make_readme.py
index 893204b5..6ad070c1 100755
--- a/tools/readme_generator/tests/test_make_readme.py
+++ b/tools/readme_generator/tests/test_make_readme.py
@@ -26,9 +26,11 @@ def test_running_make_readme():
         )
 
         # Now run test...
-        subprocess.check_call(
-            [TEST_DIRECTORY.parent / "make_readme.py", temporary_tested_app_directory]
-        )
+        subprocess.check_call([
+            TEST_DIRECTORY.parent / "make_readme.py",
+            "--apps-dir", TEST_DIRECTORY.parent.parent,
+            temporary_tested_app_directory
+        ])
 
         assert (
             open(TEST_DIRECTORY / "README.md").read()