diff --git a/common/proto/src/main/java/org/thingsboard/server/common/adaptor/JsonConverter.java b/common/proto/src/main/java/org/thingsboard/server/common/adaptor/JsonConverter.java
index a504c287b8..2a208923d9 100644
--- a/common/proto/src/main/java/org/thingsboard/server/common/adaptor/JsonConverter.java
+++ b/common/proto/src/main/java/org/thingsboard/server/common/adaptor/JsonConverter.java
@@ -60,7 +60,6 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
-import java.util.Optional;
 import java.util.Set;
 import java.util.TreeMap;
 import java.util.function.Consumer;