diff --git a/jetty-memcached/jetty-memcached-sessions/src/main/java/org/eclipse/jetty/memcached/session/MemcachedSessionDataMap.java b/jetty-memcached/jetty-memcached-sessions/src/main/java/org/eclipse/jetty/memcached/session/MemcachedSessionDataMap.java
index 78e81f833587..0d503bc5dba6 100644
--- a/jetty-memcached/jetty-memcached-sessions/src/main/java/org/eclipse/jetty/memcached/session/MemcachedSessionDataMap.java
+++ b/jetty-memcached/jetty-memcached-sessions/src/main/java/org/eclipse/jetty/memcached/session/MemcachedSessionDataMap.java
@@ -188,13 +188,13 @@ public void store(String id, SessionData data) throws Exception
         if (!isStarted())
             throw new IllegalStateException("Not started");
         
-        final FuturePromise<Boolean> result = new FuturePromise<>();
+        final FuturePromise<Void> result = new FuturePromise<>();
         Runnable r = () ->
         {
             try
             {
                 _client.set(id, _expirySec, data);
-                result.succeeded(Boolean.TRUE);
+                result.succeeded(null);
             }
             catch (Exception e)
             {
diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/session/AbstractSessionDataStore.java b/jetty-server/src/main/java/org/eclipse/jetty/server/session/AbstractSessionDataStore.java
index 365e7ed4383e..524bccb5d881 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/session/AbstractSessionDataStore.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/session/AbstractSessionDataStore.java
@@ -182,7 +182,7 @@ public void store(String id, SessionData data) throws Exception
             //set the last saved time to now
             data.setLastSaved(System.currentTimeMillis());
             
-            final FuturePromise<Boolean> result = new FuturePromise<>();
+            final FuturePromise<Void> result = new FuturePromise<>();
             Runnable r = () ->
             {
                 try
@@ -190,7 +190,7 @@ public void store(String id, SessionData data) throws Exception
                     //call the specific store method, passing in previous save time
                     doStore(id, data, lastSave);
                     data.clean(); //unset all dirty flags
-                    result.succeeded(Boolean.TRUE);
+                    result.succeeded(null);
                 }
                 catch (Exception e)
                 {