diff --git a/geomagio/residual/Calculation.py b/geomagio/residual/Calculation.py
index bb2548ccc5632e5a67035bd3b94b3c16ae26a6b9..37776f54ddc9fc4e505b95c9fa6ff4ff6c9276cb 100644
--- a/geomagio/residual/Calculation.py
+++ b/geomagio/residual/Calculation.py
@@ -80,8 +80,6 @@ def calculate_D_absolute(
     -------
     D Absolute
     """
-    # mean across all declination measurements
-    mean = average_measurement(measurements, DECLINATION_TYPES)
     # average mark
     average_mark = average_measurement(measurements, MARK_TYPES).angle
     # adjust based on which is larger