diff --git a/spec/unit/octo_fetcher_spec.rb b/spec/unit/octo_fetcher_spec.rb
index a4398b1..f2dbdeb 100644
--- a/spec/unit/octo_fetcher_spec.rb
+++ b/spec/unit/octo_fetcher_spec.rb
@@ -29,7 +29,7 @@ describe GitHubChangelogGenerator::OctoFetcher do
     context "when raises Octokit::Forbidden" do
       it "sleeps and retries and then aborts" do
         retry_limit = GitHubChangelogGenerator::OctoFetcher::MAX_FORBIDDEN_RETRIES - 1
-        allow(fetcher).to receive(:sleep_base_interval).and_return(0)
+        allow(fetcher).to receive(:sleep_base_interval).exactly(retry_limit).times.and_return(0)
 
         expect(fetcher).to receive(:sys_abort).with("Exceeded retry limit")
         fetcher.send(:check_github_response) { raise(Octokit::Forbidden) }