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-rw-r--r--isort/isort.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/isort/isort.py b/isort/isort.py
index c5290d58..a1f466c2 100644
--- a/isort/isort.py
+++ b/isort/isort.py
@@ -538,7 +538,7 @@ class SortImports(object):
section_title = self.config.get('import_heading_' + str(section_name).lower(), '')
if section_title:
section_comment = "# {0}".format(section_title)
- if not section_comment in self.out_lines[0:1]:
+ if not section_comment in self.out_lines[0:1] and not section_comment in self.in_lines[0:1]:
section_output.insert(0, section_comment)
output += section_output + ([''] * self.config['lines_between_sections'])