diff --git a/romancal/source_detection/source_detection_step.py b/romancal/source_detection/source_detection_step.py
index 12966848a..26de824ae 100644
--- a/romancal/source_detection/source_detection_step.py
+++ b/romancal/source_detection/source_detection_step.py
@@ -77,12 +77,11 @@ def process(self, input):
                 self.data = input_model.data
 
             # mask DO_NOT_USE pixels
-   
+
             self.coverage_mask = (
                 (dqflags.pixel["DO_NOT_USE"]) & input_model.dq
             ).astype(bool)
 
-
             # if a pre-determined threshold value for detection for the whole
             # image is provided, use this
             if self.scalar_threshold is not None:
@@ -118,8 +117,7 @@ def process(self, input):
 
             elif self.calc_threshold is not None:
                 # subtrack background from data if calculating abs. threshold
-                sources = daofind(self.data - bkg.background,
-                                  mask=self.coverage_mask)
+                sources = daofind(self.data - bkg.background, mask=self.coverage_mask)
 
             # reduce table to minimal number of columns, just source ID,
             # positions, and fluxes