diff --git a/chew/fingerprint.py b/chew/fingerprint.py
index 1339c0a..10644d6 100644
--- a/chew/fingerprint.py
+++ b/chew/fingerprint.py
@@ -346,7 +346,7 @@ def run(config: Config):
     else:
         samtools_idxstats_out = None
 
-    if config.step_bcftools_roh and autosomal_fingerprint:
+    if config.step_bcftools_roh and autosomal_fingerprint is not None:
         roh_txt_contents = bcftools_roh_step(
             sample=sample, release=genome_release, autosomal_fingerprint=autosomal_fingerprint
         )