diff --git a/nextflow.config b/nextflow.config
index fc78904..19ca198 100644
--- a/nextflow.config
+++ b/nextflow.config
@@ -157,7 +157,7 @@ params {
     // profile standardisation
     run_profile_standardisation             = false
     standardisation_taxpasta_format         = 'tsv'
-    taxpasta_taxonomy_dir                   = false
+    taxpasta_taxonomy_dir                   = null
     taxpasta_add_name                       = false
     taxpasta_add_rank                       = false
     taxpasta_add_lineage                    = false