diff --git a/spacy/cli/convert.py b/spacy/cli/convert.py
index fef6753e6..89615bbe8 100644
--- a/spacy/cli/convert.py
+++ b/spacy/cli/convert.py
@@ -14,7 +14,7 @@ from ..util import prints
 CONVERTERS = {
     '.conllu': conllu2json,
     '.conll': conllu2json,
-    '.iob': iob2json
+    '.iob': iob2json,
 }