diff --git a/conf/modules.config b/conf/modules.config
index 4b68380..870b5ae 100755
--- a/conf/modules.config
+++ b/conf/modules.config
@@ -389,6 +389,7 @@ process {
 
     // phylogenomics
     withName: IQTREE {
+        ext.args = '-fast -m HKY+F+G'
         publishDir = [
             path: { "${params.outdir}/phylogenomics/iqtree" },
             mode: params.publish_dir_mode,