diff --git a/pr_agent/git_providers/gitlab_provider.py b/pr_agent/git_providers/gitlab_provider.py
index 9ee1c0bf..2d35a3f4 100644
--- a/pr_agent/git_providers/gitlab_provider.py
+++ b/pr_agent/git_providers/gitlab_provider.py
@@ -49,7 +49,7 @@ class GitLabProvider(GitProvider):
     def _set_merge_request(self, merge_request_url: str):
         self.id_project, self.id_mr = self._parse_merge_request_url(merge_request_url)
         self.mr = self._get_merge_request()
-        self.last_diff = self.mr.diffs.list()[-1]
+        self.last_diff = self.mr.diffs.list(all=True)[-1]
 
     def _get_pr_file_content(self, file_path: str, branch: str) -> str:
         try: