diff --git a/pyproject.toml b/pyproject.toml
index 7718cf7..2d8f1f3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rda_python_dsquasar"
-version = "3.0.16"
+version = "3.0.17"
 authors = [
   { name="Zaihua Ji", email="zji@ucar.edu" },
 ]
diff --git a/src/rda_python_dsquasar/dsquasar.py b/src/rda_python_dsquasar/dsquasar.py
index c09000d..24ca8af 100644
--- a/src/rda_python_dsquasar/dsquasar.py
+++ b/src/rda_python_dsquasar/dsquasar.py
@@ -1408,7 +1408,11 @@ def gather_dataset_files(self, dsfiles, unlock = True, sizes = None):
          # them before any work, and -A 3 does a third one before tarring
          self.check_batch_deadline()
          dsid = pgrec['dsid']
-         if unlock and pgrec['pid'] and self.lock_dataset(dsid, 0, self.LOGACT) < 1: continue
+         # a changed-file run takes records that are already backed up (bid > 0) while the
+         # main runs take new files (bid = 0), so it shares no record with the worker holding
+         # the lock and must not skip the dataset for it
+         if unlock and pgrec['pid'] and not self.PGBACK['chgdays']:
+            if self.lock_dataset(dsid, 0, self.LOGACT) < 1: continue
          fcnt += self.get_dataset_files(dsid, dsfiles, pgrec['backflag'], logact, sizes)
       if dsfiles:
          s = 's' if fcnt > 1 else ''