diff --git a/winterdrp/processors/bias.py b/winterdrp/processors/bias.py
index eb1270260..c5edc6176 100644
--- a/winterdrp/processors/bias.py
+++ b/winterdrp/processors/bias.py
@@ -1,6 +1,6 @@
 import numpy as np
 import logging
-from winterdrp.processors.base_processor import ProcessorWithCache
+from winterdrp.processors.base_processor import ProcessorWithCache, ProcessorPremadeCache
 from collections.abc import Callable
 import astropy.io.fits
 from winterdrp.processors.utils.image_selector import select_from_images
@@ -63,4 +63,8 @@ def make_image(
         logger.info(f'Median combining {n_frames} biases')
         master_bias = np.nanmedian(biases, axis=2)
 
-        return master_bias, headers[0]
\ No newline at end of file
+        return master_bias, headers[0]
+
+
+class MasterBiasCalibrator(ProcessorPremadeCache, BiasCalibrator):
+    pass