diff --git a/phylogenetic/rules/construct_phylogeny.smk b/phylogenetic/rules/construct_phylogeny.smk
index 60da9a2..1e6c489 100644
--- a/phylogenetic/rules/construct_phylogeny.smk
+++ b/phylogenetic/rules/construct_phylogeny.smk
@@ -30,12 +30,15 @@ rule tree:
     benchmark:
         "benchmarks/tree.txt"
     threads: workflow.cores
+    params:
+        raxml_tree_builder_args="-f a -m GTRCAT -p 235813 -x 12345 -N 100 -i auto"
     shell:
         """
         augur tree \
             --alignment {input.alignment} \
             --output {output.tree} \
             --method raxml \
+            --tree-builder-args {params.raxml_tree_builder_args:q} \
             --nthreads {threads:q} 2>&1 | tee {log}
         """