diff --git a/tap_klaviyo/__init__.py b/tap_klaviyo/__init__.py
index c3f4544..1167cc5 100644
--- a/tap_klaviyo/__init__.py
+++ b/tap_klaviyo/__init__.py
@@ -76,7 +76,7 @@ def to_catalog_dict(self):
         return {
             'stream': self.stream,
             'tap_stream_id': self.tap_stream_id,
-            'key_properties': [self.key_properties],
+            'key_properties': self.key_properties,
             'schema': resolved_schema,
             'metadata': self.metadata
         }