diff --git a/python/triton_tvm_ffi/driver.py b/python/triton_tvm_ffi/driver.py
index 2c49b66..d9c035d 100644
--- a/python/triton_tvm_ffi/driver.py
+++ b/python/triton_tvm_ffi/driver.py
@@ -24,10 +24,14 @@ class TVMFFIUtils(object):
         return get_device_properties(device_id)
 
     def cuOccupancyMaxActiveClusters(self, *args, **kwargs):
-        return self._utils.cuOccupancyMaxActiveClusters(*args, **kwargs)
+        raise NotImplementedError(
+            '"cuOccupancyMaxActiveClusters isn\'t expected to be invoked"'
+        )
 
     def set_printf_fifo_size(self, *args, **kwargs):
-        return self._utils.set_printf_fifo_size(*args, **kwargs)
+        raise NotImplementedError(
+            '"set_printf_fifo_size" isn\'t expected to be invoked'
+        )
 
     def fill_tma_descriptor(self, *args, **kwargs):
         return self._utils.fill_tma_descriptor(*args, **kwargs)