diff --git a/src/Tools/Github/GithubMergeTool/GithubMergeTool.cs b/src/Tools/Github/GithubMergeTool/GithubMergeTool.cs
index 6e489790b23ee..8435fcd924ff0 100644
--- a/src/Tools/Github/GithubMergeTool/GithubMergeTool.cs
+++ b/src/Tools/Github/GithubMergeTool/GithubMergeTool.cs
@@ -121,6 +121,8 @@ git push {prBranchName} --force
             // 422 (Unprocessable Entity) indicates there were no commits to merge
             if (response.StatusCode == (HttpStatusCode)422)
             {
+                // Delete the pr branch if the PR was not created.
+                await _client.DeleteAsync($"repos/{repoOwner}/{repoName}/git/refs/heads/{prBranchName}");
                 return response;
             }