diff --git a/oscar/SleepLib/loader_plugins/prs1_loader.cpp b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
index 27ae1239..a50899af 100644
--- a/oscar/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/oscar/SleepLib/loader_plugins/prs1_loader.cpp
@@ -3138,7 +3138,7 @@ bool PRS1DataChunk::ParseSummaryF0V23()
         this->AddEvent(new PRS1PressureSettingEvent(PRS1_SETTING_IPAP, max_pressure));
         this->AddEvent(new PRS1PressureSettingEvent(PRS1_SETTING_PS, ps));
     } else if (cpapmode == MODE_BILEVEL_AUTO_VARIABLE_PS) {
-        int min_ps = 2;
+        int min_ps = 20;  // 2.0 cmH2O
         this->AddEvent(new PRS1PressureSettingEvent(PRS1_SETTING_EPAP_MIN, min_pressure));
         this->AddEvent(new PRS1PressureSettingEvent(PRS1_SETTING_EPAP_MAX, max_pressure - min_ps));
         this->AddEvent(new PRS1PressureSettingEvent(PRS1_SETTING_IPAP_MIN, min_pressure + min_ps));