diff --git a/src/com/android/providers/contacts/ContactsProvider2.java b/src/com/android/providers/contacts/ContactsProvider2.java
index 1af934c..a225b4d 100644
--- a/src/com/android/providers/contacts/ContactsProvider2.java
+++ b/src/com/android/providers/contacts/ContactsProvider2.java
@@ -1563,6 +1563,7 @@
             case BACKGROUND_TASK_UPGRADE_AGGREGATION_ALGORITHM: {
                 if (isAggregationUpgradeNeeded()) {
                     upgradeAggregationAlgorithmInBackground();
+                    invalidateFastScrollingIndexCache();
                 }
                 break;
             }
@@ -3836,6 +3837,7 @@
 
             case AGGREGATION_EXCEPTIONS: {
                 count = updateAggregationException(db, values);
+                invalidateFastScrollingIndexCache();
                 break;
             }