diff --git a/isort/core.py b/isort/core.py
index d587f3d01..93102e856 100644
--- a/isort/core.py
+++ b/isort/core.py
@@ -357,7 +357,8 @@ def write(self, *a, **kw):
                         all_imports.extend(
                             li
                             for li in parsed_content.in_lines
-                            if li and li not in lines_without_imports_set
+                            if li
+                            and li not in lines_without_imports_set
                             and not li.lstrip().startswith("#")
                         )