diff --git a/src/main/java/com/threerings/getdown/util/ProgressAggregator.java b/src/main/java/com/threerings/getdown/util/ProgressAggregator.java
index ba6cba2..5c1bc55 100644
--- a/src/main/java/com/threerings/getdown/util/ProgressAggregator.java
+++ b/src/main/java/com/threerings/getdown/util/ProgressAggregator.java
@@ -20,7 +20,7 @@ public class ProgressAggregator
     public ProgressObserver startElement (final int index) {
         return new ProgressObserver() {
             public void progress (int percent) {
-                _sizes[index] = percent;
+                _progress[index] = percent;
                 updateAggProgress();
             }
         };