diff --git a/tools/blast2go/go_categorize.py b/tools/blast2go/go_categorize.py
index f23b53d5..a536fa9c 100644
--- a/tools/blast2go/go_categorize.py
+++ b/tools/blast2go/go_categorize.py
@@ -1,4 +1,5 @@
 """Categorize GO terms."""
+
 from __future__ import print_function
 
 import gzip