diff --git a/q2_moshpit/plugin_setup.py b/q2_moshpit/plugin_setup.py
index bca10433..8959b9ef 100644
--- a/q2_moshpit/plugin_setup.py
+++ b/q2_moshpit/plugin_setup.py
@@ -276,9 +276,8 @@
     },
     parameters={},
     outputs={
-        "collated_kraken2_outputs": List[
+        "collated_kraken2_outputs":
             SampleData[Kraken2Outputs % P_kraken_out]
-        ]
     },
     name="Collate kraken2 outputs",
     description="Collates kraken2 outputs"