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 5733b2cd..cff4189a 100644
--- a/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy
+++ b/core/src/main/groovy/com/muwire/core/download/DownloadSession.groovy
@@ -236,9 +236,7 @@ class DownloadSession {
         if (idx == SAMPLES - 1)
             return reads[idx]
             
-        long interval = timestamps.last - timestamps[idx]
-        if (interval == 0) 
-            interval = 1
+        long interval = Math.max(1000,timestamps.last - timestamps[idx])
         for (int i = idx; i < SAMPLES; i++)
             totalRead += reads[idx]
         (int)(totalRead * 1000.0 / interval)