diff --git a/pr_agent/git_providers/gitlab_provider.py b/pr_agent/git_providers/gitlab_provider.py
index 331bdf65..590aa32e 100644
--- a/pr_agent/git_providers/gitlab_provider.py
+++ b/pr_agent/git_providers/gitlab_provider.py
@@ -515,7 +515,8 @@ class GitLabProvider(GitProvider):
 
     def get_repo_settings(self):
         try:
-            contents = self.gl.projects.get(self.id_project).files.get(file_path='.pr_agent.toml', ref=self.mr.target_branch).decode()
+            main_branch = self.gl.projects.get(self.id_project).default_branch
+            contents = self.gl.projects.get(self.id_project).files.get(file_path='.pr_agent.toml', ref=main_branch).decode()
             return contents
         except Exception:
             return ""