diff --git a/superxas_bec/devices/timepix/timepix.py b/superxas_bec/devices/timepix/timepix.py
index 6a8532b..23f493a 100644
--- a/superxas_bec/devices/timepix/timepix.py
+++ b/superxas_bec/devices/timepix/timepix.py
@@ -573,7 +573,7 @@ class Timepix(PSIDeviceBase, TimePixControl):
         self.hdf.enable.set(1).wait(5)  # Enable HDF5 plugin
         self.hdf.file_path.set(file_path).wait(5)
         self.hdf.file_name.set(file_name).wait(5)
-        self.hdf.num_capture.set(self.n_images).wait(5)
+        self.hdf.num_capture.set(num_images).wait(5)
         self.file_event.put(
             file_path=self._full_path,
             done=False,