diff --git a/src/modules/mergekmer.nf b/src/modules/mergekmer.nf
index 1737b6af736d0dc3f95a0c7872ab8cb6db84d23b..1f5659f341fba253ca6f77f61e78b5ef5fb61cf3 100644
--- a/src/modules/mergekmer.nf
+++ b/src/modules/mergekmer.nf
@@ -35,7 +35,7 @@ process COLLATEKMER {
     tuple val(specie), path(csv)
 
     output:
-    path("*.csv"), emit: csv
+    tuple val(species), path("*.csv"), emit: csv
     path "versions.yml", emit: versions
 
     script: