diff --git a/sdk/src/main/java/io/dapr/client/domain/ConversationResponse.java b/sdk/src/main/java/io/dapr/client/domain/ConversationResponse.java
index 6066df55f..805936554 100644
--- a/sdk/src/main/java/io/dapr/client/domain/ConversationResponse.java
+++ b/sdk/src/main/java/io/dapr/client/domain/ConversationResponse.java
@@ -13,6 +13,7 @@ limitations under the License.
 
 package io.dapr.client.domain;
 
+import java.util.Collections;
 import java.util.List;
 
 /**