diff --git a/sotodlib/preprocess/processes.py b/sotodlib/preprocess/processes.py
index 97ee73184..a22a3ce21 100644
--- a/sotodlib/preprocess/processes.py
+++ b/sotodlib/preprocess/processes.py
@@ -1945,7 +1945,6 @@ def select(self, meta, proc_aman=None, in_place=True):
 
         if in_place:
             meta.restrict("dets", meta.dets.vals[keep_all])
-            source_flags.restrict("dets", source_flags.dets.vals[keep_all])
             return meta
         else:
             return keep_all