diff --git a/phykit/services/alignment/faidx.py b/phykit/services/alignment/faidx.py
index 1bf7f9a..487cba0 100644
--- a/phykit/services/alignment/faidx.py
+++ b/phykit/services/alignment/faidx.py
@@ -13,7 +13,7 @@ def run(self) -> None:
         record_dict = SeqIO.index(self.fasta, "fasta")
 
         # Split entries and iterate
-        for e in map(str.strip, self.entry.split(',')):
+        for e in map(str.strip, self.entry.split(",")):
             record = record_dict[e]
             print(f">{record.name}\n{record.seq}")