diff --git a/black.py b/black.py
index d1e87a9..3842be9 100644
--- a/black.py
+++ b/black.py
@@ -2777,9 +2777,7 @@ def is_type_comment(leaf: Leaf, suffix: str = "") -> bool:
     Only returns true for type comments for now."""
     t = leaf.type
     v = leaf.value
-    return t in {token.COMMENT, STANDALONE_COMMENT} and v.startswith(
-        "# type:" + suffix
-    )
+    return t in {token.COMMENT, STANDALONE_COMMENT} and v.startswith("# type:" + suffix)
 
 
 def normalize_prefix(leaf: Leaf, *, inside_brackets: bool) -> None:
diff --git a/tests/data/comments2.py b/tests/data/comments2.py
index 489661e..f4a30b8 100644
--- a/tests/data/comments2.py
+++ b/tests/data/comments2.py
@@ -310,7 +310,7 @@ def inline_comments_in_brackets_ruin_everything():
     )
 
 
-CONFIG_FILES = [CONFIG_FILE] + SHARED_CONFIG_FILES + USER_CONFIG_FILES  # type: Final
+CONFIG_FILES = [CONFIG_FILE,] + SHARED_CONFIG_FILES + USER_CONFIG_FILES  # type: Final
 
 #######################
 ### SECTION COMMENT ###