diff --git a/bindings/python/generate_tests.py b/bindings/python/generate_tests.py
index 068a8346c..e629e9716 100755
--- a/bindings/python/generate_tests.py
+++ b/bindings/python/generate_tests.py
@@ -59,7 +59,7 @@ DO NOT EDIT this autogenerated file, run "make generate-pytests" instead
 """
 import Hamlib
 '''
-    filename = f"test_{object_name.replace(".", "_")}_class.py"
+    filename = f"test_{object_name.replace('.', '_')}_class.py"
     class_source = inspect.getsource(TestClass)
     expected_callables = repr(callables).replace(" ", "\n")
     expected_properties = repr(properties).replace(" ", "\n")