diff --git a/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy b/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy
index ec6bb3f6..0697548d 100644
--- a/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy
+++ b/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy
@@ -195,7 +195,8 @@ class DownloadSession {
             return reads[idx]
             
         long interval = timestamps.last - timestamps[idx]
-        
+        if (interval == 0) 
+            interval = 0.001
         for (int i = idx; i < SAMPLES; i++)
             totalRead += reads[idx]
         (int)(totalRead * 1000.0 / interval)