diff --git a/agentops/client.py b/agentops/client.py
index 2aa90e00..8ff82fc8 100644
--- a/agentops/client.py
+++ b/agentops/client.py
@@ -103,7 +103,9 @@ def add_tags(self, tags: List[str]):
                 tags (List[str]): The list of tags to append.
         """
         if self._tags is not None:
-            self._tags.extend(tags)
+            for tag in tags:
+                if tag not in self._tags:
+                    self._tags.append(tag)
         else:
             self._tags = tags