diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/IoTControlManager.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/IoTControlManager.java
index 2f347edeb..a1fd4f7c9 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/IoTControlManager.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/IoTControlManager.java
@@ -123,7 +123,7 @@ public final class IoTControlManager extends Manager {
      * @throws NotConnectedException
      * @throws InterruptedException
      */
-    public IoTSetResponse setUsingIq(FullJid jid, Collection<SetData> data) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
+    public IoTSetResponse setUsingIq(FullJid jid, Collection<? extends SetData> data) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
         IoTSetRequest request = new IoTSetRequest(data);
         request.setTo(jid);
         IoTSetResponse response = connection().createPacketCollectorAndSend(request).nextResultOrThrow();
diff --git a/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java b/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java
index dca7293e4..b77787f98 100644
--- a/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java
+++ b/smack-experimental/src/main/java/org/jivesoftware/smackx/iot/control/element/IoTSetRequest.java
@@ -28,7 +28,7 @@ public class IoTSetRequest extends IQ {
 
     private final Collection<SetData> setData;
 
-    public IoTSetRequest(Collection<SetData> setData) {
+    public IoTSetRequest(Collection<? extends SetData> setData) {
         super(ELEMENT, NAMESPACE);
         setType(Type.set);
         this.setData = Collections.unmodifiableCollection(setData);