diff --git a/numass-storage/numass-client/src/main/java/inr/numass/client/NumassClient.java b/numass-storage/numass-client/src/main/java/inr/numass/client/NumassClient.java
index e2a28429..37ae7b13 100644
--- a/numass-storage/numass-client/src/main/java/inr/numass/client/NumassClient.java
+++ b/numass-storage/numass-client/src/main/java/inr/numass/client/NumassClient.java
@@ -15,7 +15,11 @@
  */
 package inr.numass.client;
 
-import hep.dataforge.io.envelopes.*;
+import hep.dataforge.io.envelopes.DefaultEnvelopeReader;
+import hep.dataforge.io.envelopes.DefaultEnvelopeWriter;
+import hep.dataforge.io.envelopes.Envelope;
+import hep.dataforge.io.envelopes.EnvelopeBuilder;
+import hep.dataforge.io.messages.Responder;
 import hep.dataforge.meta.Meta;
 import hep.dataforge.meta.MetaBuilder;
 import hep.dataforge.storage.commons.MessageFactory;
diff --git a/numass-storage/numass-server/src/main/java/inr/numass/server/NumassRun.java b/numass-storage/numass-server/src/main/java/inr/numass/server/NumassRun.java
index c2a59dd2..ae30d868 100644
--- a/numass-storage/numass-server/src/main/java/inr/numass/server/NumassRun.java
+++ b/numass-storage/numass-server/src/main/java/inr/numass/server/NumassRun.java
@@ -19,7 +19,7 @@ import hep.dataforge.data.binary.Binary;
 import hep.dataforge.exceptions.StorageException;
 import hep.dataforge.io.envelopes.Envelope;
 import hep.dataforge.io.envelopes.EnvelopeBuilder;
-import hep.dataforge.io.envelopes.Responder;
+import hep.dataforge.io.messages.Responder;
 import hep.dataforge.meta.Annotated;
 import hep.dataforge.meta.Meta;
 import hep.dataforge.storage.api.ObjectLoader;