diff --git a/act/qc/qctests.py b/act/qc/qctests.py
index 2f27df036f..4d57661489 100644
--- a/act/qc/qctests.py
+++ b/act/qc/qctests.py
@@ -1017,7 +1017,7 @@ def add_persistence_test(
             index = stddev <= test_limit
 
         if ignore_range is not None:
-            ignore_index = (data >= ignore_range[0]) & (data <= ignore_range[1])
+            ignore_index = (data >= min(ignore_range)) & (data <= max(ignore_range))
             index = index & ~ignore_index
 
         result = self._ds.qcfilter.add_test(
diff --git a/tests/qc/test_qctests.py b/tests/qc/test_qctests.py
index b6dd77cbca..5807f7e62b 100644
--- a/tests/qc/test_qctests.py
+++ b/tests/qc/test_qctests.py
@@ -379,7 +379,7 @@ def test_qctests_dos():
         window=20,
         min_periods=20,
         test_limit=0.01,
-        ignore_range=[13.1, 14.8],
+        ignore_range=[14.8, 13.1],
         test_assessment='Suspect',
     )