diff --git a/armory/cli/tools/collect_outputs.py b/armory/cli/tools/collect_outputs.py
index 8afc1f0a7..c1c534a0a 100644
--- a/armory/cli/tools/collect_outputs.py
+++ b/armory/cli/tools/collect_outputs.py
@@ -549,6 +549,7 @@ def collect_armory_outputs(command_args, prog, description):
                 raise ValueError(
                     f"Collation failed: attacks {attacks} have different headers."
                 )
+            attacks.add(first)
 
             for attack in attacks:
                 log.info(f"Collating {attack} into {tgt_collate}")