diff --git a/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp b/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
index f6d0846a..5e823db5 100644
--- a/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
+++ b/oscar/SleepLib/loader_plugins/prs1_parser_xpap.cpp
@@ -2079,11 +2079,11 @@ bool PRS1DataChunk::ParseSettingsF0V6(const unsigned char* data, int size)
                 this->ParseTubingTypeV3(data[pos]);
                 break;
             case 0x48:  // ??? Seen on DreamStation 2 non-Advanced (410)
-                // Appears between 0x2C and 0x2E, but the only values we've seen other than 0 is
-                // 1, which doesn't seem to be like a reasonable pressure (for ramp pressure) nor
-                // a boolean setting, which tends to be 0x80.
+                // Appears between 0x2C (ramp time) and 0x2E (flex mode), with a value of 0-4.
                 CHECK_VALUE(len, 1);
-                CHECK_VALUES(data[pos], 0, 1);
+                if (data[pos] > 4) {
+                    UNEXPECTED_VALUE(data[pos], "0-4");
+                }
                 //this->AddEvent(new PRS1UnknownDataEvent(QByteArray((const char*) data, size), pos, len));
                 break;
             case 0x4a:  // Patient controls access, specific to DreamStation 2.