diff --git a/documentation/sphinx/source/release-notes.rst b/documentation/sphinx/source/release-notes.rst
index 005641c048..2399272bfd 100644
--- a/documentation/sphinx/source/release-notes.rst
+++ b/documentation/sphinx/source/release-notes.rst
@@ -125,6 +125,7 @@ Fixes only impacting 6.2.0+
 * The cluster controller could crash if a coordinator was unreachable when compiling cluster status. [6.2.4] `(PR #2065) <https://github.com/apple/foundationdb/pull/2065>`_.
 * A storage server could crash if it took longer than 10 minutes to fetch a key range from another server. [6.2.5] `(PR #2170) <https://github.com/apple/foundationdb/pull/2170>`_.
 * Excluding or including servers would restart the data distributor. [6.2.5] `(PR #2170) <https://github.com/apple/foundationdb/pull/2170>`_.
+* The data distributor could read invalid memory when estimating database size. [6.2.6] `(PR #2225) <https://github.com/apple/foundationdb/pull/2225>`_.
 
 Earlier release notes
 ---------------------
diff --git a/fdbserver/DataDistributionTracker.actor.cpp b/fdbserver/DataDistributionTracker.actor.cpp
index b690cd639c..b26d0b72ef 100644
--- a/fdbserver/DataDistributionTracker.actor.cpp
+++ b/fdbserver/DataDistributionTracker.actor.cpp
@@ -258,7 +258,7 @@ ACTOR Future<int64_t> getFirstSize( Reference<AsyncVar<Optional<StorageMetrics>>
 	}
 }
 
-ACTOR Future<Void> changeSizes( DataDistributionTracker* self, KeyRangeRef keys, int64_t oldShardsEndingSize ) {
+ACTOR Future<Void> changeSizes( DataDistributionTracker* self, KeyRange keys, int64_t oldShardsEndingSize ) {
 	state vector<Future<int64_t>> sizes;
 	state vector<Future<int64_t>> systemSizes;
 	for (auto it : self->shards.intersectingRanges(keys) ) {