diff --git a/pyopencl/invoker.py b/pyopencl/invoker.py
index 568d4bd1742ddb94b2899c49432787b7a8e3b1a3..d77d6a2fa9a807cbbde675b0ca61db295255f306 100644
--- a/pyopencl/invoker.py
+++ b/pyopencl/invoker.py
@@ -303,7 +303,7 @@ def _generate_enqueue_and_set_args_module(function_name,
 
 
 invoker_cache = WriteOncePersistentDict(
-        "pyopencl-invoker-cache-v38",
+        "pyopencl-invoker-cache-v41",
         key_builder=_NumpyTypesKeyBuilder())