diff --git a/phylogenetic/Snakefile b/phylogenetic/Snakefile
index d5c3e2d..19cce10 100644
--- a/phylogenetic/Snakefile
+++ b/phylogenetic/Snakefile
@@ -16,14 +16,12 @@ if not config:
 
 
 build_dir = "results"
-
-
 auspice_dir = "auspice"
 
 prefix = config.get("auspice_prefix", None)
 AUSPICE_PREFIX = ("trial_" + prefix + "_") if prefix is not None else ""
-AUSPICE_FILENAME = AUSPICE_PREFIX + config.get("auspice_name")
-
+# Defaults to the `build_name` if no `auspice_name` is provided in the config
+AUSPICE_FILENAME = AUSPICE_PREFIX + config.get("auspice_name", config["build_name"])
 
 rule all:
     input: