diff --git a/Htmldocs/release_notes.html b/Htmldocs/release_notes.html
index 83b4b468..24050842 100644
--- a/Htmldocs/release_notes.html
+++ b/Htmldocs/release_notes.html
@@ -24,6 +24,7 @@
       <li>[new] Support AVAPS in the Overview pressure chart.</li>
       <li>[fix] Fix missing bars in the Overview pressure chart for Philips Respironics devices.</li>
       <li>[fix] Add missing Philips Respironics pressure channels to CSV export.</li>
+      <li>[fix] Fix zero Philips Respironics AHI in CSV session export.</li>
       <li>[fix] Add support for the Bi-Flex lock setting on pre-DreamStation ventilators.</li>
       <li>[fix] Fix the pressure waveform scale for the BiPAP autoSV Advanced 30 (960T)</li>
       <li>[fix] Add support for rise time mode on DreamStation BiPAP devices (600X-700X).</li>
diff --git a/oscar/SleepLib/session.h b/oscar/SleepLib/session.h
index 80a167a5..4350dbdc 100644
--- a/oscar/SleepLib/session.h
+++ b/oscar/SleepLib/session.h
@@ -194,6 +194,7 @@ class Session
                     t += slice.end - slice.start;
                 }
             }
+            t = t / 3600000.0;
         }
         return t;
     }