diff --git a/github/client.go b/github/client.go
index a778d9c..dabb51d 100644
--- a/github/client.go
+++ b/github/client.go
@@ -319,6 +319,7 @@ func (c *Client) doRequest(ctx context.Context, method, reqURL string, accept st
 				timer := time.NewTimer(delay)
 				select {
 				case <-timer.C:
+					timer.Stop() // no-op after fire; kept for symmetry with the ctx.Done case
 				case <-ctx.Done():
 					timer.Stop()
 					return nil, ctx.Err()
diff --git a/github/client_test.go b/github/client_test.go
index 3d5fa4e..6d2afa6 100644
--- a/github/client_test.go
+++ b/github/client_test.go
@@ -544,6 +544,7 @@ func TestNoInsecureOption_RejectsHTTP(t *testing.T) {
 		t.Errorf("unexpected error message: %v", err)
 	}
 }
+
 func TestNoInsecureOption_RejectsUppercaseHTTP(t *testing.T) {
 	// Verify case-insensitive scheme check (RFC 3986).
 	c := NewClient("tok", "HTTP://example.com")
@@ -568,7 +569,6 @@ func TestNoInsecureOption_RejectsMixedCaseHTTP(t *testing.T) {
 	}
 }
 
-
 func TestAllowInsecureHTTP_WithoutEnvVar_Rejected(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		t.Fatal("request should not have been sent")