diff --git a/romancal/dark_current/dark_current_step.py b/romancal/dark_current/dark_current_step.py
index 414387031..77918ac9b 100755
--- a/romancal/dark_current/dark_current_step.py
+++ b/romancal/dark_current/dark_current_step.py
@@ -42,7 +42,8 @@ def process(self, input):
 
             # Do the dark correction
             out_model = input_model
-            out_model.data -= dark_model.data
+            nresultants = len(input_model.meta.exposure["read_pattern"])
+            out_model.data -= dark_model.data[:nresultants]
             out_model.pixeldq |= dark_model.dq
             out_model.meta.cal_step.dark = "COMPLETE"