diff --git a/oscar/SleepLib/loader_plugins/resmed_loader.cpp b/oscar/SleepLib/loader_plugins/resmed_loader.cpp
index 8fb5d91e..f4e5729b 100644
--- a/oscar/SleepLib/loader_plugins/resmed_loader.cpp
+++ b/oscar/SleepLib/loader_plugins/resmed_loader.cpp
@@ -2541,8 +2541,8 @@ bool ResmedLoader::LoadBRP(Session *sess, const QString & path)
             if (max > es.physical_maximum)
                 max = es.physical_maximum;
 
-            sess->setMin(code, min);
-            sess->setMax(code, max);
+            sess->updateMin(code, min);
+            sess->updateMax(code, max);
             sess->setPhysMin(code, es.physical_minimum);
             sess->setPhysMax(code, es.physical_maximum);
         }
@@ -2800,8 +2800,8 @@ bool ResmedLoader::LoadPLD(Session *sess, const QString & path)
         }
 
         if (a) {
-            sess->setMin(code, a->Min());
-            sess->setMax(code, a->Max());
+            sess->updateMin(code, a->Min());
+            sess->updateMax(code, a->Max());
             sess->setPhysMin(code, es.physical_minimum);
             sess->setPhysMax(code, es.physical_maximum);
             a->setDimension(es.physical_dimension);
@@ -2900,8 +2900,8 @@ void ResmedLoader::ToTimeDelta(Session *sess, ResMedEDFInfo &edf, EDFSignal &es,
         if ((tmp >= t_min) && (tmp <= t_max))
             el->AddEvent(tt, c);
 
-        sess->setMin(code, min);
-        sess->setMax(code, max);
+        sess->updateMin(code, min);
+        sess->updateMax(code, max);
         sess->setPhysMin(code, es.physical_minimum);
         sess->setPhysMax(code, es.physical_maximum);
         sess->updateLast(tt);