diff --git a/driver-core/src/main/com/mongodb/client/result/UpdateResult.java b/driver-core/src/main/com/mongodb/client/result/UpdateResult.java
index b96d93287f0..07123ce5bad 100644
--- a/driver-core/src/main/com/mongodb/client/result/UpdateResult.java
+++ b/driver-core/src/main/com/mongodb/client/result/UpdateResult.java
@@ -83,10 +83,10 @@ public static UpdateResult unacknowledged() {
 
     private static class AcknowledgedUpdateResult extends UpdateResult {
         private final long matchedCount;
-        private final Long modifiedCount;
+        private final long modifiedCount;
         private final BsonValue upsertedId;
 
-        AcknowledgedUpdateResult(final long matchedCount, final Long modifiedCount, @Nullable final BsonValue upsertedId) {
+        AcknowledgedUpdateResult(final long matchedCount, final long modifiedCount, @Nullable final BsonValue upsertedId) {
             this.matchedCount = matchedCount;
             this.modifiedCount = modifiedCount;
             this.upsertedId = upsertedId;