diff --git a/aider_gitea/gitea_client.py b/aider_gitea/gitea_client.py
index e239af1..a10afd8 100644
--- a/aider_gitea/gitea_client.py
+++ b/aider_gitea/gitea_client.py
@@ -178,6 +178,8 @@ class GiteaClient:
         """
         Fetch comments for a pull request.
         """
+        # sanitize pr_number to ensure it's just the numeric ID, not a full URL
+        pr_number = pr_number.rstrip('/').split('/')[-1]
         url = f'{self.gitea_url}/repos/{owner}/{repo}/pulls/{pr_number}/comments'
         response = self.session.get(url)
         response.raise_for_status()