diff --git a/pyopencl/scan.py b/pyopencl/scan.py
index 6291de9bb287ff2830336c36b4da6b2b2f6381c3..6218d5716b409557341f4e8ce12105ad0dcf1a30 100644
--- a/pyopencl/scan.py
+++ b/pyopencl/scan.py
@@ -1480,6 +1480,9 @@ class GenericScanKernel(_GenericScanKernelBase):
             # We're done here. (But pretend to return an event.)
             return cl.enqueue_marker(queue, wait_for=wait_for)
 
+        from pyopencl.tools import expand_runtime_arg_list
+        data_args = list(expand_runtime_arg_list(self.parsed_args, args))
+
         # }}}
 
         l1_info = self.first_level_scan_info
@@ -1510,9 +1513,6 @@ class GenericScanKernel(_GenericScanKernelBase):
 
         # }}}
 
-        from pyopencl.tools import expand_runtime_arg_list
-        data_args = list(expand_runtime_arg_list(self.parsed_args, args))
-
         # {{{ first level scan of interval (one interval per block)
 
         scan1_args = data_args + [