diff --git a/config/confighttp/confighttp_test.go b/config/confighttp/confighttp_test.go
index 369c4df4683..54a2ce46b3a 100644
--- a/config/confighttp/confighttp_test.go
+++ b/config/confighttp/confighttp_test.go
@@ -1609,7 +1609,7 @@ func TestOperationPrefix(t *testing.T) {
 			go func() {
 				_ = s.Serve(ln)
 			}()
-			status, err := http.Get(fmt.Sprintf("http://%s", ln.Addr().String()))
+			status, err := http.Get("http://" + ln.Addr().String())
 			require.NoError(t, err)
 			require.Equal(t, http.StatusOK, status.StatusCode)
 			require.NoError(t, s.Close())
@@ -1619,5 +1619,4 @@ func TestOperationPrefix(t *testing.T) {
 			require.False(t, strings.HasPrefix(spanName, ":"))
 		})
 	}
-
 }