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-rw-r--r--lib/gitlab/diff/file_collection/merge_request_diff.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/gitlab/diff/file_collection/merge_request_diff.rb b/lib/gitlab/diff/file_collection/merge_request_diff.rb
index dc4d47c878b..fe7adb7bed6 100644
--- a/lib/gitlab/diff/file_collection/merge_request_diff.rb
+++ b/lib/gitlab/diff/file_collection/merge_request_diff.rb
@@ -39,7 +39,7 @@ module Gitlab
# hashes that represent serialized diff lines.
#
def cache_highlight!(diff_file)
- item_key = diff_file.cache_key
+ item_key = diff_file.file_identifier
if highlight_cache[item_key]
highlight_diff_file_from_cache!(diff_file, highlight_cache[item_key])