diff --git a/src/java/com/threerings/presents/server/PresentsInvoker.java b/src/java/com/threerings/presents/server/PresentsInvoker.java
index d02423256..8cfc9d359 100644
--- a/src/java/com/threerings/presents/server/PresentsInvoker.java
+++ b/src/java/com/threerings/presents/server/PresentsInvoker.java
@@ -63,7 +63,8 @@ public class PresentsInvoker extends Invoker
         synchronized (this) {
             buf.append("- Max queue size: ").append(_maxQueueSize).append("\n");
             buf.append("- Units executed: ").append(_unitsRun);
-            buf.append(" (").append(1000*_unitsRun/sinceLast).append("/s)\n");
+            long runPerSec = (sinceLast == 0) ? 0 : 1000*_unitsRun/sinceLast;
+            buf.append(" (").append(runPerSec).append("/s)\n");
             if (_currentUnit != null) {
                 String uname = StringUtil.safeToString(_currentUnit);
                 buf.append("- Current unit: ").append(uname).append(" ");